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Welding inverter AIS 250 scheme. Common malfunctions of welding inverters and their elimination

Repair, despite its complexity, in most cases you can do it yourself. And if you have a good understanding of the design of such devices and have an idea of \u200b\u200bwhat is more likely to fail in them, you can successfully optimize the cost of professional service.

Purpose of equipment and features of its design

The main purpose of any inverter is the formation of a constant welding current, which is obtained by rectifying a high-frequency variable. The use of high frequency alternating current, converted by a special inverter module from a rectified mains, due to the fact that the strength of such a current can be effectively increased to the required value using a compact transformer. It is this principle put into operation that allows such equipment to have compact dimensions with high efficiency.

Welding inverter circuit that defines it specifications, includes the following main elements:

primary rectifier unit, which is based on a diode bridge (the task of such a unit is to rectify alternating current coming from a standard electrical network);
an inverter unit, the main element of which is a transistor assembly (it is with the help of this unit that the direct current supplied to its input is converted into an alternating current, the frequency of which is 50–100 kHz);
a high-frequency step-down transformer, on which, by lowering the input voltage, the strength of the output current increases significantly (due to the principle of high-frequency transformation, a current can be generated at the output of such a device, the strength of which reaches 200–250 A);
output rectifier assembled on the basis of power diodes (the task of this inverter unit is to rectify high-frequency alternating current, which is necessary for welding).

The welding inverter circuit contains a number of other elements that improve its operation and functionality, but the main ones are those listed above.

Features of maintenance and repair of inverter devices

Repair of an inverter-type welding machine has a number of features, which is explained by the complexity of the design of such a device. Any inverter other than welding machines other types, is electronic, which requires specialists involved in its maintenance and repair to have at least basic radio engineering knowledge, as well as skills in handling various measuring instruments– voltmeter, digital multimeter, oscilloscope, etc.

In progress Maintenance and repair, the elements of which it consists are checked. This includes transistors, diodes, resistors, zener diodes, transformer and choke devices. The design feature of the inverter is that very often during its repair it is impossible or very difficult to determine the failure of which element caused the malfunction.

In such situations, all details are sequentially checked. To successfully solve such a problem, it is necessary not only to be able to use measuring instruments, but also to understand electronic circuits well enough. If you don’t have such skills and knowledge at least at the initial level, then repairing a welding inverter with your own hands can lead to even more serious damage.

Realistically assessing their strengths, knowledge and experience and deciding to take on self repair inverter-type equipment, it is important not only to watch a training video on this topic, but also to carefully study the instructions in which manufacturers list the most common malfunctions welding inverters, as well as ways to eliminate them.

Factors leading to the failure of the welding inverter

Situations that can cause the inverter to fail or lead to malfunctions can be divided into two main types:

associated with the wrong choice of welding mode;
caused by the failure of parts of the device or their incorrect operation.

The method for identifying an inverter malfunction for subsequent repair is reduced to the sequential execution of technological operations, from the simplest to the most complex. The modes in which such checks are performed and what their essence is is usually specified in the instructions for the equipment.

If the recommended actions do not lead to the desired results and the operation of the device is not restored, most often this means that the cause of the malfunction should be sought in the electronic circuit. The reasons for the failure of its blocks and individual elements may be different. We list the most common.

Moisture has penetrated the inside of the unit, which may occur if the unit is exposed to precipitation.
On elements electronic circuit dust has accumulated, which leads to a violation of their full cooling. The maximum amount of dust gets into the inverters when they are operated in very dusty rooms or on construction sites. In order to prevent the equipment from getting into such a state, its interior must be cleaned regularly.
Overheating of the elements of the electronic circuit of the inverter and, as a result, their failure can be caused by non-compliance with the duty cycle (DU). This parameter, which must be strictly observed, is indicated in the technical data sheet of the equipment.

Common faults

The most common faults encountered in the operation of inverters are as follows.

Unstable burning of the welding arc or active spatter of metal

This situation may indicate that the current strength is incorrectly selected for welding. As you know, this parameter is selected depending on the type and diameter of the electrode, as well as on the speed of welding. If the packaging of the electrodes you are using does not contain recommendations on the optimal current strength, you can calculate it using a simple formula: 20–40 A of welding current should fall on 1 mm of electrode diameter. It should also be borne in mind that the lower the welding speed, the lower the current strength should be.

Sticking of the electrode to the surface of the parts to be joined

This problem can be due to a number of reasons, most of which are based on low supply voltage. Modern models of inverter devices also operate at reduced voltage, but when its value drops below the minimum value for which the equipment is designed, the electrode begins to stick. A voltage drop at the output of the equipment can occur if the device blocks do not make good contact with the panel jacks.

This reason is eliminated very simply: by cleaning the contact sockets and fixing the electronic boards in them more tightly. If the wire with which the inverter is connected to the mains has a cross section of less than 2.5 mm2, this may also lead to a voltage drop at the input of the device. This is guaranteed to happen even if such a wire is too long.

If the length of the supply wire exceeds 40 meters, it is almost impossible to use an inverter for welding, which will be connected with it. The voltage in the supply circuit may also drop if its contacts are burnt or oxidized. common cause sticking of the electrode becomes insufficiently high-quality preparation of the surfaces of the parts to be welded, which must be thoroughly cleaned not only from existing contaminants, but also from the oxide film.

Inability to start the welding process when the machine is turned on

This situation often occurs in case of overheating of the inverter apparatus. At the same time, the control indicator on the device panel should light up. If the glow of the latter is barely noticeable, and the function sound alert the inverter is missing, then the welder may simply not be aware of overheating. This state of the welding inverter is also characteristic of a break or spontaneous disconnection of the welding wires.

Spontaneous shutdown of the inverter during welding

Most often, this situation occurs if the supply voltage is turned off. circuit breakers, the operating parameters of which are incorrectly selected. When working using an inverter apparatus, circuit breakers rated for a current of at least 25 A must be installed in the electrical panel.

Inability to turn on the inverter when turning the toggle switch

Most likely, this situation indicates that the voltage in the supply network is too low.

Automatic shutdown of the inverter during continuous welding

Most modern inverter devices are equipped with temperature sensors, which automatically turn off the equipment when the temperature in its internal part rises to a critical level. There is only one way out of this situation: give the welding machine a rest for 20-30 minutes, during which it will cool down.

How to repair an inverter device yourself

If, after testing, it becomes clear that the cause of malfunctions in the operation of the inverter device lies in its internal part, you should disassemble the case and proceed to inspect the electronic filling. It is possible that the reason is poor-quality soldering of device parts or poorly connected wires.

Careful inspection of electronic circuits will reveal faulty parts, which may be darkened, cracked, with a swollen case, or have burnt contacts.

During repair, such parts must be removed from the boards (it is advisable to use a soldering iron with suction for this), and then replaced with similar ones. If the marking on the faulty elements is not readable, then special tables can be used to select them. After replacing faulty parts, it is advisable to test the electronic boards using a tester. This is especially necessary if the inspection did not reveal the elements to be repaired.

A visual check of the electronic circuits of the inverter and their analysis with a tester should begin with a power unit with transistors, since it is he who is the most vulnerable. If the transistors are faulty, then, most likely, the circuit (driver) that swings them has also failed. The elements that make up such a circuit also need to be checked first.

After checking the transistor block, all other blocks are checked, for which a tester is also used. Surface printed circuit boards must be carefully examined to determine the presence of burnt areas and cliffs on them. If any are found, then you should carefully clean such places and solder jumpers on them.

If burnt or broken wires are found in the filling of the inverter, then during repair they must be replaced with similar ones in cross section. Although the diode bridges of the inverter rectifiers are fairly reliable elements, they should also be rung with a tester.

The most complex element of the inverter is the key management board, on the serviceability of which the performance of the entire device depends. Such a board for the presence of control signals that are fed to the gate busses of the key block is checked using an oscilloscope. The final step in testing and repairing the electronic circuits of the inverter device should be to check the contacts of all available connectors and clean them with a regular eraser.

Self-repair of such an electronic device as an inverter is quite complicated. It is almost impossible to learn how to repair this equipment just by watching a training video, for this you need to have certain knowledge and skills. If you have such knowledge and skills, then watching such a video will give you the opportunity to make up for the lack of experience.

Inverter welding machines are gaining more and more popularity among master welders due to their compact size, light weight and reasonable prices. Like any other equipment, these devices can fail due to improper operation or due to design flaws. In some cases, repair of inverter welding machines can be carried out independently by examining the device of the inverter, but there are breakdowns that are fixed only in a service center.

Welding inverters, depending on the models, operate both from a household electrical network (220 V) and from a three-phase (380 V). The only thing to consider when connecting the device to a household network is its power consumption. If it exceeds the possibilities of electrical wiring, then the unit will not work with a sagging network.

So, the device of the inverter welding machine includes the following main modules.

Primary Rectifier. This block, consisting of a diode bridge, is located at the input of the entire electrical circuit of the apparatus. It is on it that alternating voltage is supplied from the mains. To reduce the heating of the rectifier, a heat sink is attached to it. The latter is cooled by a fan (supply) installed inside the unit housing. Also, the diode bridge has protection against overheating. It is implemented using a temperature sensor, which, when the diodes reach a temperature of 90 °, breaks the circuit.
Condenser filter. Connected in parallel to a diode bridge to smooth out AC ripples and contains 2 capacitors. Each electrolyte has a voltage margin of at least 400 V, and a capacitance of 470 microfarads for each capacitor.
Noise filter. During the current conversion processes in the inverter, electromagnetic interference occurs, which can disrupt the operation of other devices connected to this electrical network. To remove interference, a filter is installed in front of the rectifier.
inverter. Responsible for converting AC voltage to DC. Converters operating in inverters can be of two types: push-pull half-bridge and full bridge. Below is a diagram of a half-bridge converter with 2 transistor switches, based on MOSFET or IGBT series devices, which are most often seen on medium-sized inverter devices. price category.
The full bridge converter circuit is more complex and already includes 4 transistors. These types of converters are installed on the most powerful welding machines and, accordingly, on the most expensive ones.
Just like diodes, transistors are mounted on heatsinks for better heat dissipation. To protect the transistor block from voltage surges, an RC filter is installed in front of it.
high frequency transformer. It is installed after the inverter and lowers the high-frequency voltage to 60-70 V. Thanks to the inclusion of a ferrite magnetic core in the design of this module, it became possible to reduce the weight and reduce the dimensions of the transformer, as well as reduce power losses and increase the efficiency of the equipment as a whole. For example, the weight of a transformer having an iron magnetic circuit and capable of providing a current of 160 A will be about 18 kg. But a transformer with a ferrite magnetic core with the same current characteristics will have a mass of about 0.3 kg.
Secondary output rectifier. It consists of a bridge, which includes special diodes that react very quickly to high-frequency current (opening, closing and restoring takes about 50 nanoseconds), which ordinary diodes are not capable of. The bridge is equipped with radiators to prevent overheating. Also, the rectifier has protection against power surges, implemented in the form of an RC filter. At the output of the module, there are two copper terminals that provide reliable connection of the power cable and ground cable to them.
Control board. All inverter operations are controlled by a microprocessor, which receives information and controls the operation of the device using various sensors located in almost all units of the unit. Thanks to microprocessor control, selected ideal parameters current for welding different kind metals. Also, electronic control allows you to save energy by supplying precisely calculated and dosed loads.
Soft start relay. So that during the start-up of the inverter the rectifier diodes do not burn out from the high current of charged capacitors, a soft start relay is used.

How an inverter works

Below is a diagram that clearly shows the principle of operation of the welding inverter.

So, the principle of operation of this module of the welding machine is as follows. The primary rectifier of the inverter receives voltage from the household electrical network or from generators, gasoline or diesel. The incoming current is variable, but passing through the diode block, becomes permanent. The rectified current is fed to the inverter, where it is inversely converted to alternating current, but with changed frequency characteristics, that is, it becomes high-frequency. Further, the high-frequency voltage is reduced by a transformer to 60-70 V with a simultaneous increase in current strength. At the next stage, the current again enters the rectifier, where it is converted to direct current, after which it is fed to the output terminals of the unit. All current conversion controlled microprocessor unit management.

Causes of breakdowns of inverters

Modern inverters, especially those made on the basis of an IGBT module, are quite demanding on the operating rules. This is explained by the fact that during the operation of the unit, its internal modules give off a lot of heat. Although both heatsinks and a fan are used to remove heat from power units and electronic boards, these measures are sometimes not enough, especially in inexpensive units. Therefore, it is necessary to strictly follow the rules that are indicated in the instructions for the device, which imply periodic shutdown of the unit for cooling.

This rule is usually referred to as “Duration On” (DU), which is measured as a percentage. Not observing the PV, the main components of the apparatus overheat and fail. If this happens with a new unit, then this failure is not subject to warranty repair.

Also, if the inverter welding machine is running in dusty rooms, dust settles on its radiators and interferes with normal heat transfer, which inevitably leads to overheating and breakdown of electrical components. If it is impossible to get rid of the presence of dust in the air, it is necessary to open the inverter case more often and clean all the components of the device from accumulated contaminants.

But more often than not, inverters fail when they work at low temperatures. Breakdowns occur due to the appearance of condensate on a heated control board, resulting in a short circuit between the parts of this electronic module.

Repair features

A distinctive feature of the inverters is the presence of an electronic control board, so only a qualified specialist can diagnose and fix a malfunction in this unit. In addition, diode bridges, transistor blocks, transformers and other parts of the electrical circuit of the device may fail. To carry out diagnostics with your own hands, you need to have certain knowledge and skills in working with measuring instruments such as an oscilloscope and a multimeter.

From the foregoing, it becomes clear that, without having the necessary skills and knowledge, it is not recommended to start repairing the device, especially electronics. Otherwise, it can be completely disabled, and the repair of the welding inverter will cost half the cost of a new unit.

The main malfunctions of the unit and their diagnostics

As already mentioned, inverters fail due to the impact on the “vital” blocks of the apparatus of external factors. Also, malfunctions of the welding inverter can occur due to improper operation of the equipment or errors in its settings. The following malfunctions or interruptions in the operation of inverters are most often encountered.

The device does not turn on

Very often this failure is caused network cable failure device. Therefore, you first need to remove the casing from the unit and ring each cable wire with a tester. But if everything is in order with the cable, then more serious diagnostics of the inverter will be required. Perhaps the problem lies in the standby power supply of the device. The technique for repairing the "duty room" using the example of a Resant brand inverter is shown in this video.

Welding arc instability or metal spatter

This fault can be caused by incorrect current setting for a certain electrode diameter.

Advice! If there are no recommended current values on the package for the electrodes, then it can be calculated using the following formula: for each millimeter of equipment, there should be a welding current in the range of 20-40 A.

It should also be taken into account welding speed. The smaller it is, the lower the current value must be set on the control panel of the unit. In addition, in order for the current strength to correspond to the diameter of the additive, you can use the table below.

Welding current not adjustable

If the welding current is not adjusted, the cause may be regulator failure or violation of the contacts of the wires connected to it. It is necessary to remove the casing of the unit and check the reliability of the connection of the conductors, and also, if necessary, ring the regulator with a multimeter. If everything is in order with it, then this breakdown can be caused by a short circuit in the inductor or a malfunction of the secondary transformer, which will need to be checked with a multimeter. If a malfunction is found in these modules, they must be replaced or rewound by a specialist.

Large power consumption

Excessive power consumption, even when the machine is unloaded, causes, most often, interturn short circuit in one of the transformers. In this case, you will not be able to repair them yourself. It is necessary to take the transformer to the master for rewinding.

The electrode sticks to the metal

This happens if network voltage drops. To get rid of the electrode sticking to the parts to be welded, you will need to correctly select and adjust the welding mode (according to the instructions for the machine). Also, the voltage in the network may sag if the device is connected to an extension cord with a small wire section (less than 2.5 mm 2).

It is not uncommon for a voltage drop to cause electrode sticking to occur when using a power extension that is too long. In this case, the problem is solved by connecting the inverter to the generator.

Burning overheat

If the indicator is on, this indicates overheating of the main modules of the unit. Also, the device may spontaneously turn off, which indicates thermal protection trip. So that these interruptions in the operation of the unit do not happen in the future, again, it is required to adhere to the correct duty cycle (PV). For example, if PV = 70%, then the device must operate in the following mode: after 7 minutes of operation, the unit will be given 3 minutes to cool down.

In fact, there can be quite a lot of various breakdowns and causes that cause them, and it is difficult to list them all. Therefore, it is better to immediately understand what algorithm is used to diagnose the welding inverter in search of faults. You can find out how the device is diagnosed by looking at the following tutorial.

Hello!!! The other day, a welding inverter was brought in for repair, perhaps my note about this repair will be useful to someone.

This is not the first welding machine that had to be done, but if in one case the malfunction manifested itself as follows: I turned on the inverter in the network ... and boom, the circuit breakers in the electrical panel were knocked out. As the autopsy showed in the welder, the output transistors broke through, after the replacement everything worked.

But in this case, everything was somewhat different, according to the owner, the device sometimes stopped cooking, although the power indicator was on. These guys opened the case themselves - they tried to determine the malfunction and noticed that the inverter reacted to the bending of the board, i.e. when it was bent, it could earn. But when the welding inverter came to me, it no longer turned on at all, even the power indicator did not light up.

Welding inverter does not turn on

"Titan - BIS - 2300" - it was this inverter model that went into repair, the circuitry repeats the Resant welding machine of similar power and, as I assume, many other inverters. You can view and download the diagram

This welding machine is used to power low-voltage circuits. impulse block power supply, just it was faulty. The UPS is made on the PWM controller UC 3842BN. Analogues - domestic 1114EU7, Imported UC3842AN differs from BN only in lower current consumption, and KA3842BN (AN). The UPS schematic is below. (Click on it to enlarge) Red marks the voltages that the working UPS was already producing. Please note that you need to measure voltages of 25V not relative to a common minus, but from points V1+, V1- and also V2+, V2- they are not connected to a common bus.

The UPS key is made on a transistor, field worker 4N90C. In my case, the transistor remained intact, but the microcircuit required replacement. There was also a break in the resistor R 010 - 22 Om / 1Wt. After that, the power supply worked.

However, it was too early to rejoice, having measured the voltage at the output of the welder, it turned out that it was not there, but in the mode idle move should be about 85 volts. I tried to move the board, remember from the words of the owner it affected, but nothing.

Further searches revealed the absence of one of the voltages of 25 volts at points V2-, V2 +. The reason is a break in the winding transformer 1-2. I had to solder the trance, used a medical needle to release the findings.

In the transformer, one of the ends of the winding was cut off from the output.

We carefully restore the connection using a suitable wiring, it will not be superfluous to fix the restored connection with a drop of glue or sealant. I had polyurethane glue at hand and used it, we make an audit of other conclusions, if necessary, we solder it.

Before installing the transformer, you should prepare the board so that it effortlessly enters its place. To do this, you need to clean the holes from the remnants of the solder, you can also do this with a needle from a syringe of a suitable diameter.

After installing the transformer, the welding inverter started working.

How to check the microchip

How to check the microcircuit without soldering it from the board and what else to look for.

You can partially check the microcircuit with a voltmeter and an adjustable stabilized constant voltage source. A complete test requires a signal generator and an oscilloscope.

Let's talk about what's easier. Before checking, be sure to turn off the power supply to the inverter. Next - from an external regulated power supply to pin 7 of the microcircuit, we apply a voltage of 16 - 17 volts, this is the startup voltage of the MS. At the same time, pin 8 should be 5 V. This is the reference voltage from the internal stabilizer of the microcircuit.

It should remain stable when the voltage at pin 7 changes. If this is not the case, the MS is faulty.

When changing the voltage on the microcircuit, keep in mind that below 10 V the microcircuit turns off and turns on at 15-17 volts. You should not increase the supply voltage of the MS above 34 V. There is a protective zener diode inside the microcircuit and, if the voltage is too high, it will simply break through.

Below is the block diagram of UC3842.

Addition to this article: After some time, they brought another device. Failed due to falling on its side. This happened because during operation, the screws securing the case became loose, and some simply got lost, so when it fell, the board played and touched the case with the mounting side. As a result of the short circuit, all 4 output transistors K 30N60HS failed. After replacing everything worked.

That's all! If you found this article useful, leave your comments, share with friends by clicking on the social network buttons.

The welding inverter differs from the conventional welding machine in an easier and better welding process. However, malfunctions of the welding inverter, due to its more complex design, can be more serious and complex.

To determine the cause of the breakdown of the device, you need to diagnose it: check transistors, resistors, diodes, stabilizers, contacts, etc. Each device comes with detailed instructions with a description of the most common faults that you can fix yourself. However, very often, special equipment may be required for repairs: an ohmmeter, voltmeter, multimeter, oscilloscope. And you need to know how to use them. And in special cases, knowledge in electronics, the ability to work with electrical circuits is necessary. Therefore, if an independent check and elimination of simple malfunctions described below did not lead to success, it is better to entrust the repair of the inverter apparatus to the masters in the service center.

What are inverter faults?

There are several groups of breakdowns of welding inverters:

malfunctions arising from non-compliance with the norms of the welding workflow specified in the instructions;
malfunctions arising as a result of improper operation or failure of the elements of the device;
damage caused by moisture, dust and foreign objects entering the device.

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Common malfunctions that you can fix yourself

Consider some of the most common malfunctions of welding inverters:

To identify and eliminate the cause of the malfunction, the body of the apparatus is opened and a visual inspection of its contents is carried out.

The welding arc is unstable or the electrode spatters the material. The reason for this may lie in wrong choice current. The current strength must correspond to the type and diameter of the electrode and the speed of the welding process. If the current strength is not indicated on the packaging of the electrodes, then you can start supplying current from 20-40 A per millimeter of electrode diameter. When reducing the welding speed, the amperage must also be reduced.
The electrode sticks to the material. Often this is due to low voltage in the network, the value of which is less than the minimum allowable when working with the inverter. The reason for sticking of the electrode can also be poor contact in the sockets of the panel, which can be eliminated by fixing the boards more tightly. Using an extension cable with a wire size smaller than 2.5 mm2 or with a wire that is too long (more than 40 m) may reduce the voltage. Burnt or oxidized contacts in an electrical circuit can also lower the voltage.
There is no welding process, while the machine is connected to the network. In this case, you need to check the presence of mass on the part to be welded. Also check the inverter cable for damage.
The device turns off by itself. The device is switched off at the moment the transformer is connected to the network, after which its protection is activated. The reason for this may be a short circuit in the voltage circuit. Protection can be activated not only when the wires are shorted to each other or with the case, but also when the short circuit between the turns of the coils or the breakdown of capacitors. To repair a floor, you first need to turn off the transformer and find the fault, and then insulate or replace the damaged element.

If there is no welding when the machine is switched on, check the connection of the electrode holder cable.

During a long period of operation, the device turned off. Most likely, this is not a breakdown, but an overheating of the inverter. It is necessary to wait 20-30 minutes, and then resume work. You should follow the rules for operating the device: do not overheat it, that is, take breaks in operation, connect appropriate current values \u200b\u200bto it, do not use electrodes of too large diameters.

The transformer emits a strong hum and overheats. Perhaps the reason for this was the overload of the transformer, the loosening of the bolts that tighten the sheets of the magnetic circuit, or the breakdown of the core fastening. Due to the short circuit between the sheets of the magnetic circuit or cables, the device can also hum strongly. Tighten all fastening elements and restore cable insulation.

Welding current is poorly regulated. The reason for this may be breakdowns in the current regulation mechanism: a malfunction in the current regulation screw, a short circuit between the regulator mounts, a short circuit in the inductor, poor mobility of the secondary coils as a result of blockage, etc. Remove the casing from the inverter and examine the current regulation mechanism in order to identify a breakdown.

The welding arc breaks abruptly, and it is impossible to ignite it, only sparks appear. Perhaps the problem lies in the breakdown of the winding high voltage, a short between the wires, or a poor connection to the inverter terminals.

High current consumption at no load. The reason may be the closure of the turns on the coil. You can eliminate it either by restoring the insulation, or by completely rewinding the coil.

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If excessive spatter of the electrode metal occurs during welding, the cause may be an incorrectly selected value of the welding current.

If a smell of burning and smoke appeared from the body of the device, this may indicate a serious breakdown. In this case, a qualified repair at a service center may be necessary.

To identify a malfunction, the case is first disassembled. Perform a visual inspection of parts for damage, cracks, burnt contacts and swelling of capacitors. They also check the soldering points of parts and contacts on the inverter boards. Often the causes of a malfunction lie precisely in poor-quality soldering, they can be easily eliminated by re-soldering the parts.

All defective parts should be unsoldered and replaced with new ones corresponding to this model of the device.

You can select parts in accordance with the markings indicated on the body of the device or in a special guide.

You need to solder the parts with a soldering iron that has a suction, which will make the work convenient and fast.

Designed for periodic construction and repair work, produces manual arc welding with stick electrodes (MMA). Ideal for welding work in the country, at home, in the garage. It is possible to weld in an atmosphere of protective inert gas argon - (TIG), on DC non-consumable tungsten electrode. The circuit of the power part of the inverter is made on IGBT transistors (K40H603) and diodes 60F30. The control board on the PWM controller and the operational amplifier allows you to use the "HOT START", "ANTI-STICK", "ARC FORCE" functions. Power Supply ELITECH IS 200 on the chip and MOSFET transistor provides the necessary voltage for the operation of the electronic circuit of the inverter.

Supply voltage - 220V
Open circuit voltage - 85V
Welding current range - 10-180A
Load duration at current 180A - 60%
Load duration at a current of 100A - 100%
The diameters of the electrodes used are 1.6-5mm