Welding metal products can help good owner at any time. Therefore, the welding machine can be considered an indispensable thing in household. With such an apparatus you can perform small repair work Alone. Most often welding work It is necessary in the countryside, where the need for repairing barriers, building a greenhouse or creating any other metallic design may appear.

Buying a new factory semi-automatic manner can fly into a considerable penny, so each owner has a dilemma at some point, what to do, buy a new device or make a welding semi-automatic with your own hands.

Most of your own hands make a semi-automatic inverter. If there is an ordinary inverter in the farm, it will not be much difficult to make a semi-automatic work, you just need to comply with the manufacturer's instructions and acquire several additional parts.

But it should be noted that to perform such work it is necessary to have basic knowledge of electrical engineering and simplest physical laws. At the same time, it is important to compete in good faith to manufacture, collect the necessary tool and not throwing the work started.

Device homemade welding semi-automatic

The scheme of the welding semiautoma is quite simple, and not much different from the usual welding machine. semiautomatic welding apparatus is characterized in that instead of the classical electrodes, which must be changed in the course robots, the filler wire used. Such a feature is that there is a mechanism for the supply of welding wire, which gives it to the weldable area gradually and continuously. This allows welding work continuously, performing the most even as possible and uniform seams.

The resistance of such a device is considerably lower in comparison with the arc, so you can repair welding semiautomatic with their hands without much effort and tools.

When the wire is applied in the welding zone, the area of \u200b\u200bthe molten metal is formed, which instantly connects the surfaces, literally gluing them, forming the highest quality seam of high strength.

With the help of self-made welding semiautoma, you can weld the practical all types of metal products, including stainless steel and non-ferrous metals. Moreover, the technique of performing welding works is quite simple and to master it easily independently with the help of educational materials. But you can also go through special courses, where you will teach welding techniques, will tell about the specifics and the slightest features of the use of semi-automatic. Visiting courses, learn to the welding case may even beginner, never dealing with the welding machines of any case.

Roughly speaking, the welding semi-automatic consists of three parts, the electrical responsible for the flow of current, the wire mechanism is responsible for supplying the filing wire, as well as the burner required to create a gas environment with a special nozzle.

The gas medium is necessary to create a protective inert cloud, which prevents the oxidation of the molten metal. For these purposes, carbon dioxide is most often used. Gas cylinder Connects to the device through the entrance nozzle.

In some cases, the use of a cylinder is not necessary, since it is possible to use a special coating with a special coating that creates a self-defense medium. Easy use and lack of need for the application of the cylinder made a semi-automatic with such a wire particularly popular among homemade craftsmen.

The principle of operation of the device is rather simple, an alternating current is supplied from the mains that is transformed into a permanent one. This feature performs a special module in a set with a transformer and rectifiers.

When performing welding work, it is important to observe the preservation of the balance of the current, voltage and the feed rate of the filing wire. Changing the balance to any of the parties may result in low-quality seam. To save the balance in such cases, use the power supply of a rigid volt-ampere characteristic. This allows you to adjust the voltage and force of the supplied current, which allows you to achieve the highest quality connection.

Required tools and materials

To make a semi-automatic inverter you need to prepare the following equipment:

1. Inverter. When choosing this component, it is important to pay attention to this indicator as the strength of the current. It is important that its level is not less than 150a.
2. Wire supply mechanism for semi-automatic. It will be responsible for the continuous supply of filler wire, which should be borne evenly, without jerks and slowdowns.
3. Burner. This component is responsible for melting the additive wire.
4. Hose. Through this hose will be supplied to the winding wire to the workspace.
5. Gas hose. Required for supplying protective gas, usually carbonate, to the welding area to protect the seam from oxidation.
6. Coil. The coil should be located a fierce wire with which it should be served without delays.
7. The electronic unit. It is necessary to control the operation of the semi-automatic agent, with its help the strength of the current supply, voltage and the speed of execution of work are regulated.

Most of the components can be found high quality without much effort and use them without significant changes. But special attention It is worth paying the feeding mechanism. In order that the welding works corresponded to all requirements, the supply of wire through a flexible supply hose should be carried out in accordance with the rate of its melting.

Given the fact that the semi-automatic may be used to bond different metals, the welding speed and the type of filler wire may vary considerably. That is why it is very important to be able to adjust the speed of the feeding mechanism.

The selection of wire depends on the purpose of performing welding and the processed metal. The additive wire differ not only depending on the material, but also from the diameter. You can usually find a wire with a diameter of 0.8, 1, 1.2, and 1.6 mm. The appropriate wire must be postponed to the coil. The quality of the finished seam is directly dependent on the quality of this preparatory robot.

The coil is then attached using a special fastening or homemade design to the device. During the execution of works, the wire is automatically unwound and fed to the workspace. This allows you to significantly simplify and speed up the process of connecting metal elements with welding, making it more efficient and simple for beginners.

The control unit consists of a microcontroller required to stabilize the current. It should be noted that this composite element Responsible for the possibility of adjusting the current during work.

Creating a semi-automatic welding inverter

Before using the inverter as the basis for the welding semiautoma, it is necessary to make some manipulations with its composite transformer. It needs to be remade, and the alteration of the inverter in the semi-automatic device does not require special knowledge and effort, it is easy to produce, observing only some rules.

All you need to do is apply an additional layer on it, which should consist of a copper strip and thermal paper. Note that in no case in any case, for these purposes, it is impossible to use a conventional copper wire, as it can overheat and disable the entire device in the process.

Small manipulations also need to be held with the secondary winding. According to the instructions, you need to apply three layers of tin, isolated with fluoroplastic ribbon. Ends of having and applied winding should be soldered. Such simple manipulation will significantly increase the conductivity of currents.

It is very important that the inverter is equipped with a fan necessary to cool the apparatus and prevent overheating.

Wire supply mechanism

The wire feed mechanism for the semi-automatic can be purchased in almost every store of electrical engineering. But it can also be made independently of the remedies. Specialists recommend for these purposes to find engines from automotive wipers, a couple of suitable plates, bearings and a roller with a diameter of 2.5 cm, which must be installed on the motor shaft. Bearings are in turn installed on the plates. The resulting design is pressed against the roller using a spring.

Wrapped on the roller wire stretches between the bearing and roller. All components are attached on the plate, the thickness of which should not be less than 1 cm made of durable plastic. Wire output must coincide with the place of attachment of the feed hose.

Preparation of transformer

The transformer preparation consists of creating an additional winding, install the necessary components and test connection to the network. Assembled welder must function properly, do not overheat when connecting to the network and that it is important to fully respond to the current regulation.

It is also very important to check insulation and apply additional when identifying problems. Then check the operation of the feeding mechanism, the speed and uniformity of the wire feed.

After preparing and verifying the working components, you can proceed to the performance of work.

Power supply

Power for semiautomatic welding can serve a variety of sources, such as the previously mentioned inverter, a rectifier and a transformer. The electric current enters the welding machine from the three-phase network. It is recommended to use an inverter when making a self-made machine.

In compliance with the relevant recommendations and the choice of high-quality components, you can get a high-quality apparatus made by your own hands, which will serve as a farm for one year and will become a real assistant when performing small home repairs.

The use of a semi-automatic welding machine allows you to simplify work with metals. This technique can easily connect various alloys. Make a welding semiautomatic device with your own hands from the existing inverter, and homemade aggregate It will differ versatility and functionality to use, allowing you to save on the purchase of industrial equipment.

Design features

Design feature of the semi-automatic welding machine is a constant supply of expendable wire welding zone, which is used instead of metal electrodes. Wire supply is automatically carried out, with the ability to change the speed of movement of flexible electrodes. The welding wire used will ensure constant contact of the connected surfaces, such a material in comparison with standard electrodes has a smaller resistance, which improves the quality of the connection.

Semi-automatic welding is distinguished by universality, which allows using this technology to weld various metals in their characteristics, including stainless steel, colored alloys, aluminum and others. Master the proper technique of semi-automatic welding will not be difficult. Homemade devices They differ simplicity in operation, so they can be recommended to conventional homeowners. Depending on its type, semiautomatic can have an additional gas supply nozzle, and the metallic compound is carried out in a protective environment, which makes it possible to exclude in the subsequent formation of corrosion in the weld.

The inverters offered today in the stores are distinguished by universality, and many of them have a realized function two in one. With small power and dimensions and semi-automatic two in one can work with refractory metals and thick metal blanks.

Many homeowners who often have to perform welding work are solved on the manufacture of such equipment on their own. The advantages of homemade semi-automatic inverters can be attributed to the following:

Among the shortcomings of the technology and the equipment itself can be noted the high cost of semi-automatic, which with similar characteristics to the inverter may have cost two to three times higher. It is not surprising that many homeowners are solved on the manufacture of equipment with their own hands, which allows to significantly reduce costs without losing it as an executed device.

Making your own hands

It is easiest to perform a homemade semi-automatic inverter based on a powerful power unit. Make an inverter can be independently or used from the existing equipment. For semi-automatic, use inverters with a capacity of at least 150 amps.

There are alteration schemes of techniques that allow you to set the power that will be enough for the implementation of semi-automatic welding. The device of this type will be difficult in implementation, therefore, it is possible to recommend using low-power power blocks. Only experienced radio amateurs that can make a truly complex technique.

You can make high-quality equipment in the presence of a half-automatic start-up scheme welding inverter. The characteristics of such an aggregate include the following:

• Primary current - 8- 12 A.
• Power supply - 220 or 380 volts.
• Host stroke voltage - 36-42 volts.
• Welding current - 40-120 amps.
• Voltage adjustment in a pitch plus-minus 20%.

These are the optimal parameters for the household welding semiautoma, which can cope with metals different in terms of refractors. In the subsequent, using additional drawings in the inverter power, change the basic characteristics, what allows you to apply such equipment in household and industrial purposes.

Necessary components

To perform a garage welding machine of semiautoma, you will need the following:

• Burner prefix for the inverter.
• Wire supply mechanism.
• Durable internal hose for welding wire.
• Bobbin with wire.
• Sealed gas supply hose.
• Inverter control unit.

The easiest way to position the inverter and the mechanical control unit in a separate box, for which the blocks from the old computer are used. The presence of nutrition in the system unit allows you to significantly simplify the manufacture of equipment.

Roller wire for wire can be made from the motor from the automotive wipers. Under such a motor design the frame of the mechanism, which is cut out of metal elements and is welded or bonded by a bolted compound.

The burner and the hose can be made independently of the gun from mounting foam and silicone. You can also purchase ready-made kits, which will ensure the safety of working with a semi-automatic basis and simplifies its manufacture.

Performing a wire feed mechanism, all components used must be located opposite each other, which will subsequently provide uniform feeding of flexible electrodes. Rollers should be centered relative to the fitting in one connector, subsequently, it will allow smoothly change the feed rate of the wire. Welding semi-automatic wire feed regulator circuit can easily find on the Internet.

All used metal elements should be fixed on a sheet of plywood, dense plastics or textolite. Since electricity is supplied to the used metal elements, you should check the grounding of each node. This will eliminate the possibility of short circuits, which can lead to serious breakdowns of technology.

Mechanic Management Scheme

For the supply of welding wire will be answered by a small electromotor and an extension mechanism, the operation of which is controlled using the PWM regulator. The quality of the welding will be directly dependent on the uniform of the welding wire supply in working area. It is necessary to pay due attention to the correctness of the manufacture of welding semi-automatic schemes.

On the front of the inverter, an alternating controller resistor is installed, after which they start assembling the motor start and valve control relay, which is responsible for supplying an inert gas. Contact groups of controllers must be triggered simultaneously when you press the start button on the burner.

The operation of supplying gas must be adjusted so that the valve opens for a few seconds earlier, the wire will begin in the welding zone. Otherwise, the melting occurs in the atmospheric environment, after which the wire will begin to burn instead of melt. It will not be possible to achieve a high-quality connection and reliable welding seam when combustion will be impossible.

To delay the switching on the wire feed, you must perform the simplest relay, for which the condenser will be required and 875 transistor. You can use the simplest relay from the car, which connects to 12 volts on the computer power supply.

The valve itself can be used from various automotive locking devices. The easiest way to remake the air valve from the gas-24 car. You can also choose an electric valve from the gearbox from gas cylinders.

All existing controls and PWM feed regulator of the welding semi-automaton wire are located on the front panel of the system unit. A ready-made inverter with a capacity of at least 150 amps is connected to the control unit and the supply controller with a gas wire with a gas. It will remain a trial launch and, if necessary, make appropriate adjustments to the operation of the welding wire supply system and protective gas.

In progress silence block The inverter semi-automatic will be heated, which can lead to the breakdowns of the inverter and control boards. The repair of the unit after such damage will be extremely complex. To avoid this need to be installed inside the inverter and the system unit, thermal sensors and coolers, which can effectively cool the working equipment.

You can use a optocouple pair that connects to the general control unit for the equipment. If the temperature is exceeded inside the inverter, the sensors will send the corresponding signals to the actuator, turning off the power supply until the device is fully cooling.

Additionally, various coolers from old computers can be used to cool the system unit. Coolers will differ in their sizes. You can choose a fan that can cope with high-quality cooling of the system unit, inside of which the inverter is located and other automation. The cooler used is connected to a 12 volt power supply unit directly or through a thermal sensor, which, with an increase in temperature inside the case, will send a voltage signal. The control unit will turn on the fan, which ensures the rapid cooling of the housing of the semi-automatic apparatus.

The assembly of a semi-automatic welding machine does not represent a special complexity, so every homeowner will be able to cope with such work. It is only necessary to use a high-quality powerful inverter, and the burner with the drive is best taken from industrial factory semi-automatic. This will significantly simplify the manufacture of equipment. On the Internet you can find various schemes The execution of semi-automatic welding machines, which will not be much difficult to implement. Such a device will be different to functionality and versatility to use.

A good owner must have a welding semiautomatic device, especially with the owners of cars and private property. You can always make small work with him. If you need to fool the machine part, make a greenhouse or create some kind metal designthen such a device will become an indispensable assistant In the personal economy. There is a dilemma: buy or make it yourself. If there is an inverter in the presence, it is easier to do it yourself. It will cost much cheaper than buying in the trading network. True, you will need at least basic knowledge on the basics of electronics, availability required tool and desire.

Creating a semi-automatic inverter with your own hands

Structure

The inverter can be removed into a welding semiautomatic for welding fine steel (low-alloyed and corrosion-resistant) and aluminum alloys with their own hands. It is only necessary to understand the intricacies of the coming work and in the nuances of manufacture. The inverter is a device that serves to reduce the electrical voltage to the required level to power the welding arc.

The essence of the welding process by semi-automatic in the protective gas environment is as follows. Electrode wire with constant speed is supplied to the burning area of \u200b\u200bthe arc. Protective gas is supplied to the same region. Most often - carbon dioxide. This ensures a qualitative seam, which is not inferior to the metal connected, while there are no slags in the connection, since the welding bath is protected from negative influence Air components (oxygen and nitrogen) protective gas.

The following elements should be included in the set of such semi-automatic:

• current source;
• welding process control unit;
• wire supply mechanism;
• sleeve for supplying protective gas;
• call carbon dioxide;
• pistol burner:
• coil with wire.

Welding post device

Principle of operation

When connecting the device to email. Network There is an AC convert to permanent. This requires a special electronic module, high-frequency transformer and rectifiers.

For high-quality welding, it is necessary that the future device has such parameters such as voltage, the current strength and the feeding speed of the welding wire were in a certain equilibrium. This contributes to the use of an arc power supply having a rigid volt-ampere characteristic. The arc length determines the rigidly specified voltage. Wire feed speed adjusts the welding current. It must be remembered to get from the device. the best results welding.

The easiest way to use concept scheme From Sanycha, who has long made such a semi-automatic inverter and successfully uses them. It can be found on the Internet. Many homemade craftsmen not only produced a welding semi-automatic with their own hands according to this scheme, but also improved it. Here is the initial source:

Scheme of welding semiautoma from Sanycha

Semiautomatic Sanycha

For the manufacture of a Sanych transformer used 4 cores from TS-720. The primary winding wote copper wire Ø 1.2 mm (number of turns of 180 + 25 + 25 + 25 + 25), for the secondary winding used a bus 8 mm 2 (number of turns 35 + 35). Rectifier assembled on a two-speech scheme. For the switch, chose a galeretick paired. Diodes installed on the radiator so that they did not overheat during the work. The capacitor placed in the device with a capacity of 30000 μF. The filter throttle was performed on the core from TS-180. The power part is included in the operation using the TKD511-DOD contactor. The power transformer is installed by TS-40, rotated to 15V voltage. The roller of the extension mechanism in this semiautoma has Ø 26 mm. It contains a guide groove with a depth of 1 mm and a width of 0.5 mm. The regulator circuit runs from voltage 6B. Its enough to ensure the optimal supply of welding wire

As perfecting its other craftsmen, you can read posts on various forums on this issue and understand the nuances of manufacturing.

Setting inverter

To ensure high-quality semi-automatic operation with small dimensions, the best use of toroidal type transformers. They have the highest efficiency.

The transformer for the operation of the inverter is prepared as follows: it must be wrapped in a copper strip (40 mm wide, a thickness of 30 mm) protected by the thermal paper required. The secondary winding is performed from 3 layers of tin, isolated from each other. To do this, you can use fluoroplastic ribbon. The ends of the secondary winding at the output must be soldered. In order for such a transformer uninterrupted and did not overheat, it is necessary to install a fan.

Transformer winding circuit

Works on the configuration of the inverter begin with de-energizing the power part. Rectifiers (input and output) and strength keys must have radiators for cooling. Where the radiator is located, which is most heated during the work, it is necessary to provide a thermal sensor (its testimony during the work should not exceed 75 0 s). After these changes, the strength part is connected to the control unit. When turned on in email. The network should light up the indicator. Using an oscilloscope, you must check the pulses. They must be rectangular.

The frequency of their follows should be in the range of 40 ÷ 50 kHz, and they must have a time interval of 1.5 μs (time is adjusted by changing the input voltage). The indicator should show at least 120a. It will not be superfluous to verify the device under load. This is performed by inclusion of the loading row of 0.5 ohms into the welding wires. It must withstand current in 60a. This is checked with a voltmeter.

Properly assembled inverter When performing welding work makes it possible to adjust the current in a wide range: from 20 to 160a, and the choice of the operating force depends on the metal to be welded.

For the manufacture of inverter own hands You can take a computer unit that should be in working condition. The housing must be enhanced by adding rigidity ribs. It is mounted electronic part, made according to the Sanych scheme.

Feed wire

Most often in such homemade semi-automatic collections, it is possible to supply the welding wire Ø 0.8; 1.0; 1.2 and 1.6 mm. The feed rate should be adjusted. The feeding mechanism together with welding burner You can buy in the trading network. If you wish and the availability of the necessary parts, it can be done with your own hands. Related innovators for this use the electric motor from the janitors of the car, 2 bearings, 2 plates and roller Ø 25 mm. The roller is installed on the motor shaft. Bearings are fixed on the plates. They pressed against the roller. Compression is carried out using a spring. The wire, passing through the special guide between the bearings and the roller, is stretched.

All components of the mechanism are installed on a plate with a thickness of at least 8-10 mm made of textolite, while the wire must be extinguished in the place where the connector connects to the welding sleeve. Here the coil is installed with the necessary Ø and the wire brand.

Exact mechanism

The homemade burner can be made with their own hands, using the pattern below, where its components are clearly shown in disassembled form. Its purpose is to close the chain, ensure the supply of protective gas and welding wire.

Device homemade burner

However, those who wish to make a semi-automatic will faster can buy a ready-made gun in the trading network along with the sleeves for supplying protective gas and welding wire.

Balloon

To feed in the burning area of \u200b\u200bthe welding arc of the protective gas, it is best to buy a balloon standard type. If you use carbon dioxide as a protective gas, you can use the fire extinguisher's cylinder by removing the mouthpiece from it. It must be remembered that it requires a special adapter that is needed to install the gearbox, since the carving on the cylinder does not match the thread on the neck of the fire extinguisher.

Semi-automatic with your own hands. Video

About the layout, assembly, checking the homemade semiautoma you can learn from this video.

Inverter welding semiautomatic coat with their own hands has undoubted advantages:

• cheaper store analogues;
• compact dimensions;
• the ability to cook a thin metal even in hard-to-reach places;
• it will become pride of a man who created him with his own hands.

Any welder knows the advantages of a semi-automatic in front of a manual electric welding. By virtue of its great prevalence and low cost, MMA inverters are in the arsenal of many masters. But with MIG welding, the case is different - these devices are more expensive. But, there is a way out - you can make a semi-automatic inverter with your own hands. If you delve into this question, it will be not so complicated.

Between MMA and MIG welds there are cardinal differences. For the operation of semiautoma, carbon dioxide is needed (or a mixture of carbon dioxide with argon) and the electrode wire, which is supplied to the welding location through a special hose. Those. The principle of welding semi-automatic welding is more difficult, but it is universal and its use is justified. What is needed to work semi-automatic:

• wire supply device;
• burner;
• wire and gas supply hose to heating
• current source with constant voltage.
• And in order to turn the welding inverter into a semiautomatic device, you will need a tool, time and desire.

Preparation

The manufacture of welding semiautoma at home begins with work planning. There are two options for making MIG welding from the inverter:

1. Fully make welding semi-automatic with your own hands.
2. Alterate only the inverter - the feeding mechanism is ready to purchase.

In the first case, the cost of parts for the feeding device will be released about 1000 rubles, without the work, of course. If the factory semi-automatic includes everything in one case, then homemade will consist of two parts:

1. Welding inverter.
2. Box with a feeding mechanism and a wirefront.

First, you need to decide on the case for the second part of the semi-automatic. It is desirable that it is easy and spacious. The feeding mechanism needs to be kept clean, otherwise the wire will be served by jerks, in addition, it is possible to periodically change the reels and adjust the mechanism. Therefore, the box should be easily closed and open.

Perfect option - Apply the old system unit:

1. neat appearance - it does not matter much, but much more pleasant when the insides of the homemade do not stick out and the semiautomatic of MMA inverter looks good;
2. easy, closes;
3. the housing is thin - it is easy to make the necessary cuts;
4. gas valve and wire feed drive work from 12 volts. Therefore, the power supply is suitable from the computer, and it is already built into the housing.

Now you need to estimate the size and location of future parts in the case. You can cut exemplary layouts from cardboard and check their mutual location. After that, you can start work.

The optimal option for the electrode wire is the coil weighing 5 kg. Its outer diameter is 200 mm, internal - 50 mm. For the axis of rotation, you can use the sewer PVC pipe. Its external diameter is 50 mm.

Burner

Homemade semiautomatics need to be equipped with a burner. It can be done independently, but better to buy ready setwhich includes:

1. Burner with a set of tips of different diameters.
2. Hose.
3. Euro connector.

Normal burner can be purchased for 2-3 thousand rubles. Moreover, the device homemade, so you can not chase expensive brands.

What to pay attention to when choosing a kit:

• what welding current is calculated by the burner;
• the length and rigidity of the hose is the main task of the hose, ensure the free supply of wire to the burner. If it is soft - any inflection will slow down movement;
• springs near the connector and burner - they do not give the hose to overwhelm.

Feeder

Electrode wire must be supplied continuously and evenly - then welding will be high-quality. The feed rate should be adjusted. There are three options how to make a device:

1. Buy a fully prepared mechanism assembly. Expensive, but quickly.
2. Buy only feed coils.
3. Do everything with your own hands.

If the third option is selected, you will need:

• two bearing, guide roller, tension spring;
• the engine for supplying the wire - the motor is suitable from janitor;
• metal plate for fastening the mechanism.

One clamping bearing - it must be adjustable, the second serves as a roller support. Principle of manufacture:

• the plates are made for the engine shaft and for fastening bearings;
• motor is fixed in rear plate;
• a guide roller is put on the shaft;
• top and bottom are fixed bearings;

Bearings are best put on metal strips - one edge is attached by a bolt to the main plate, and a spring with an adjusting bolt is connected to another.

The mechanism made is placed in the case so that the rollers are located on the same line with the burner connector, i.e. so that the wire is not worked out. Before rollers, you need to install a rigid tube to align the wire.

Realization of electrical part

To do this, you will need:

• two automotive relays;
• diode;
• pWM engine regulator;
• condenser with transistor;
• electromagnetic idling valve - for supplying gas to the burner. Any vaza model is suitable, for example from the eight;
• wires.

The control circuit of the supply of wire and gas is pretty simple and is implemented as follows:

• when you press the button on the burner, relays №1 and relay number 2;
• relay number 1 includes a gas supply valve;
• relay number 2 works in a pair with a condenser and includes a wire feeding with a delay;
• the wire broach is made with an additional button bypassing the gas supply relay;
• to remove self-induction from the electromagnetic valve, a diode is connected to it.
• It is necessary to provide the burner connection to the power cable from the inverter. To do this, close to the euro connector, you can set the quick-release connector and connect it to the burner.

The semi-automatic apparatus has such a sequence of operation:

1. The gas supply is included.
2. With a small delay, the wire feed turns on.

Such a sequence is needed that the wire immediately falls into a protective environment. If you make a semiautomatic device without a delay - the wire will slide. To implement it, you will need a capacitor and a transistor through which the engine control relays is connected. Operating principle:

• voltage is fed to the condenser;
• it is charging;
• the current is fed to the transistor;
• the relay turns on.

The capacitance of the capacitor should be selected so that the delay is approximately 0.5 seconds - this is enough to fill the welding bath.

After assembly, the mechanism needs to be tested, and the manufacturing process can be seen on the video.

Alteration of inverter

To make a semi-automatic in the usual inverter with your own hands, you will have to remake it a little. If you connect the MMA inverter to the collected housing - cook it will turn out. But at the same time the quality of welding will be far from the factory semi-automatic. It's all about the Wah - Volt-ampere characteristics. The electric arc inverter issues a falling characteristic - the outlet voltage floats. And for the correct operation of the semiautoma, a rigid characteristic is required - the device supports constant voltage at the output.

Therefore, to use your inverter as a current source, you need to change it to the WA (volt ampere characteristic). To do this, you will need:

• toggle switch;
• variable resistor and two permanent;

Get a hard characteristic on the inverter is quite simple. To do this, you need to put the voltage divider in front of the shunt, controlling the welding current. For the divider, constant resistors are used. Now you can get the necessary maclivolts, which will be proportional to the outlet voltage, and not the strength of the current. Minus in such a scheme one - the arc is too tough. To soften it, you can use a variable resistor that connects to the divider and the exit from the shunt.

Plus this approach is that the arc hardness adjustment appears - there is such a setting only in professional semi-automatic semi-automatic matters. And the toggle switch switches the inverter between MMA and MIG modes.

Thus, the alteration of the MMA inverter into a semi-automatic, the task, though not simple, but quite implemented. At the exit, the device is obtained, not inferior to the factory in its characteristics. But at the same time significantly cheaper. The cost of such a rework - 4-5 thousand rubles.

The welding semiautomatic device is not too simple to collect from the inverter, as this task will require certain knowledge in the field of electronics, the ability to discourage various elements. It is necessary to be well-informed in terms of key principles of equipment, allowing welding work in semi-automatic mode.

To remake the inverter device from manual mode, you will need to use certain equipment. You also need to have a number of components, without which the full performance of work is not possible:

• Since semi-automatic welding will work from the inverter, you will need to take an inverter capable of forming a welding current, which will achieve at least 150 A;
• Special mechanism providing uniform and constant wire feed;
• Burner, which is a key working element;
• The hose of the required diameter, through which the wire supply will occur;
• Another hose by which special protective gas will be supplied to the metal welding zone;
• The coil with the welding wire wrapped on it, however, this item will have to redo it in a certain way;
• A special electronic unit block through which will be managed by the work of the self-made welding semiautoma.

It is necessary to pay the most attention to the feeder, which is responsible for the supply of wire into the welding zone. To obtain the most accurate seam without various defects with outside, the vehicle feed rate in the homemade welding semiautoma is selected so that the wire has time to fully melt and form high-quality seams.

It is worth noting that in the semi-automatic welding process, wire of various diameters and made from different materials, respectively, the melting indicator will be different. To work with welding semiautomatics, it was as convenient as possible, in the homemade design, a mechanism for adjusting the speed of the device will be provided, which will serve the wire.

How to remake the transformer from the inverter?

To ultimately high-quality semi-automatic welding machine, you must subjected to a certain alterars inverter transformer. It is not too difficult to do this, however, for this you will have to follow a number of certain rules.

First of all, you need to make a transformer winding. To do this, you will need a copper strip and winding from thermal paper. It is necessary to find exactly the lane, the wire for these purposes is not suitable, since the welding semiautomatic collected by such a method will become very hot.

Secondary winding also needs a certain alteration. In the welding semi-automatic diagram you need to make another transformer winding, which includes three layers of tin.

Each of them will be addressed to isolate due to tape from fluoroplastic materials. The ends of the native winding and the made independently will need to be soldered together, starting them in a printed circuit board.

This technological solution Promotes a significant increase in current conductivity. To know how to make a welding semiautomatic with your own hands, you need to remember the need to make a fan semi-automatic semiautomates in the scheme, which will be used to cool the entire design, without allowing its overheating.

How to configure the inverter apparatus for semi-automatic welders?

To make certain changes in the scheme of self-made welding machines, semi-automatic, you must first delay this design. For additional protection against overheating on radiators, you need to install the input and output rectifier, as well as power keys.

When all these actions are produced, the power portion of the welding machine is connected to the control unit and try to connect it to the power grid. At first, the indicator says that the product is connected. Before trying the product in welding, it is necessary to connect the oscilloscope to the outputs and it is used to try to find electrical impulses, the frequency of which should be in the range from 40 to 50 kHz. Between them should be maintained with a gap of 1.5 μs - this effect can be achieved by changing the input voltage. As soon as the optimal voltage is found, you can try to connect the welding wire and cook two blanks.

How to establish a feed mechanism?

Schemes of self-made welding machines involve the presence of a special feed mechanism. If there is no workpiece of this item, you can collect it yourself according to the drawings.

To do this, you will need to take two bearing, the value of which must correspond to the Size 6202, also need an electric motor from automotive janitors, and the less its size will be, the better.

When the selection of the welding machine and its compliance with the welding semiautoma scheme, it is necessary to carefully check that it rotates strictly in one direction. In addition, it will be necessary to take a roller with a diameter of exactly 25 mm. It is planted over the thread on the electric motor shaft. All non-standard structural elements are made independently - so subsequently it will be much easier to produce.

The feed mechanism includes two plates on which bearings are installed. Between them is a roller with an electric motor connected to it. Plates are compressed at the expense of the spring, the same element of the circuit homemade mechanism The feed allows pressing the bearings to the roller. The assembly of the mechanism is performed on a special textolite plate, its thickness is about 5 mm. Do it in such a way that the welding wire leaves the mechanism in the area of \u200b\u200bthe connector.

This connector, in turn, will be connected to the welding sleeve installed on the front of the case. The coil with a wedged coil is connected to the same plate. To keep the coil well on the feeding mechanism, a special shaft is made under it, which is attached perpendicular to the textolite plate. With the edge of the shaft there should be a carving, so that the coil is as close as possible on it.

The scheme of the welding semi-automatic, made independently, is distinguished by practicality, reliability and efficiency. It is worth noting that certainly the design will look too attractive, but by its performance characteristics It will not differ from professional industrial equipment.

All elements located in the feeding mechanism are calculated under the standard coil. However, this design has one serious drawback - welding work will be made.

How is the throttle winding?

That the throttle worked reliably and did not overheat when passing through it electric currentYou need to use the OSM-0.4 transformer, the power of which is 400 W. In addition, in the manufacture quality design We will have to use the enamel, the diameter of which the minimum should be 1.5 mm, however, it is better to take with a small margin, for example, 1.8 mm.

Two layers of wire should be wounded on the throttle, and they must be qualitatively isolated from each other. The wires in each of them are laid as tight as possible - it is necessary to obtain a high-quality induction coil. At the next step, it should be used by aluminum bus with dimensions of 2.8x4.65 mm.

It is winding into one layer, manufacturing 24 turns, and the remaining ends make a length of about 30 cm. In the future, it will be necessary to assemble the core, there should be a gap between it and the coil with a size of approximately 1 mm. To ensure that the connection is as hard as possible, there will be small pieces of textolite between the core and windings.

A similar throttle can be made on the basis of iron from a colored or black and white tube TV like TS-270, and it will be much easier, since only one coil, which is made from the aluminum tire will be installed.

To power the control circuit, it is also necessary to use the transformer, and this design is assembled independently optionally, since you can purchase at a small price ready product. The main criterion is that the design should produce 24 V at a current of about 6 A.

Summarize

If the whole design is correctly assembled, it will be very convenient to use it, and its service life will exceed even professional devices. However, with incorrect assembly, the most vulnerable element of the design will be a wire feed regulator, so at times these items will need to carry out repair or preventive work.

Otherwise, welding metal parts with the help of a semi-automatic apparatus, collected by their own hands, is pretty comfortable and simple, since this technology is much simpler compared to traditional manual electric arc welding.