How to repair a welding machine yourself
The welding machine is simple. Therefore, knowing the principle of operation of the welding machine and its filling, many problems can be solved independently. This applies even to modern models, which contain parts that do not affect the quality of welding, but facilitate the use of the equipment. Next we will consider repair of welding machines
contents of the article:
Troubleshooting minor problems
Most problems here do not lead to the device turning off and completely refusing to work. Welding continues, but with extraneous sounds, poor quality of the seam, and difficulties in operating the machine itself. This suggests that the problem is not that serious, but can be easily fixed. For example:
- Welding metal crumbles during firing. In most cases, this is due to a mismatch between the wire type and current strength. When packaging consumables, the appropriate amperage range is indicated. Settings are made for it;
- Sometimes the welding machine turns on, but the arc cannot be started. Contacts are checked as repairs to ensure they are not broken and to determine whether grounding is difficult;
- Buzzing and other strange noises may indicate that the screws are bad. Not only the housing fastenings are checked, but also other connections. They just drag on;
- The electrode can stick to the weld even with the correct amperage. This is due to low voltage in the network itself, which can be easily detected using a voltmeter. This can be corrected by installing intermediate devices, replacing the voltage or network cable of the welding machine;
- If there are problems with the terminal assembly, then the repair will require dismantling the wires and all contact pads. Often such a breakdown occurs due to the use of the welding machine in conditions that do not comply with the instructions;
- The overheating indicator can operate until a critical value is reached. This usually doesn’t require fixing. Just listen whenever the indicator gives signals that require adjustment. And it is best to place the welding machine in a cool place;
- If the arc burns poorly or not every time, there may be poor contact of the wires in the sockets of the device. If you twist the locks clockwise, this will be enough to repair;
- Weakness of the archwire is sometimes due to wearing it too long, which prevents the tension from continuing its resistance. To fix this, buy an extension cord with one more section.
To fix this, sometimes you just need to optimize something or tweak it a little. Parts need to be replaced, as, for example, when the force drops rapidly during welding. This is often caused by improper operation of the circuit breaker, which is only being replaced; nothing can be repaired here.
Repair method
The basic method used when repairing welding machines is as follows:
- Check for visible damage – cracks, deposits, darkening of the body and swelling. This way, you can immediately imagine in which part you will find the skewed change;
- Check the overhead network to make sure the table is working properly. Sometimes you just have to wait until the effort improves on its own;
- Find out about the principle of operation of the device and its composition in order to know which parts you should pay special attention to during repairs;
- Study the characteristics of the welding machine, as you can understand where there are deviations and excesses, and where everything is within generally accepted standards.
Next comes the exam. For example, like no one else, you study the entire welding system, how damage can be found, which will then form the basis of tasks. First, all electronics are checked, then, for example, gas appliances, since they break down and are damaged less often than other parts.
And the further repair project will depend on the part and the degree of its destruction. By repairing a welding machine with your own hands, you can not only extend its service life, but also learn more about the structure and methods of repairing the most important parts.
In principle, when repairing a welding machine, it is correct to determine the malfunction
Inverter devices
The main difficulty in repairing inverters is that they are actually electrical. For this reason, it is necessary to arm yourself with more than a simple set of tools, and also be able to work with electrical equipment. Here, a huge number of tasks are recorded by a multimeter or oscilloscope that you need to master.
Failure detection is an iterative process, the steps of which are already popular. So, to find the problem, you will need:
- Check the radiator diode bridges. Then the wiring is disconnected, the input and output rectifiers are removed from the board, after which, by ringing with a multimeter between them, the damaged components are determined. Replacement is made with a soldering iron, but not an ordinary one, but one that has the ability to suction;
- The driver parts are checked with an ohmmeter. The deformed part must be desoldered and then replaced;
- Checking transistors. As a rule, these parts most often fail, problems with them immediately make themselves felt – you have every chance of having cracks in the case, burnt leads. But if faults are not visible, they can always be identified using a multimeter, which is used to test all transistors one by one.
Typically, the test method is suitable for all inverter welding machines; for most, the system is similar and differs in small details.
Welding inverters, for example, are more complex in design, as they consist of a large number of electrical components. Consequently, they strongly require specialized knowledge in electronics.
Transformer devices
This device, compared to inverters, contains a simple composition, as a result of which even those welders who do not weld every day and do not understand the structure of the transformer have every chance of repairing it. The repair method here depends on the type of problem:
- Arc breakage occurs due to a short circuit and breakdown of the winding. Qualification is possible by simply checking the windings and drives. The solution is to replace the distorted part;
- Activation of protection during normal connection. Here the problem may lie in the capacitor, which will have to be completely replaced during this time. But most often the problem lies somewhere in the cable wires, magnetic circuit sheets or coil turns. At this time, you can simply re-insulate the wiring system;
- Humming noise during operation, excessive heating. There can be many reasons – the load is very high due to long, endless work, the welding wire does not fit the profile, the force is inappropriate. The cause may also be a faulty coil core or a short circuit in the wires. As a result, the repair method depends on the specific malfunction – sometimes you just need to correct, tighten or insulate something, and sometimes this little thing needs to be changed completely.
These are common and well-known breakdowns. But in fact, a short circuit often occurs in the coil winding, which leads to insulation burnout. Here, for example, repairing electric welding will not be the most common, since it requires great vigilance and cleanliness when rewinding the coil to a new one.
The design of transformer devices is simpler; repairing them yourself is not difficult.
Rectifiers and semi-automatic devices
Rectifiers are a cross between an inverter and a transformer, and as a result, methods that are favorable to both types of equipment have a good chance of being used to repair a welding machine. In most cases, it is necessary to rewind the coils, restore the insulation and replace parts (most often the capacitor and regulator).
The control unit and diode rectifier also have every chance of being damaged, but they can be repaired autonomously only if you have knowledge of working with electronics.
Between the inverters and rectifiers there are semi-automatic welding machines. As a result, the bulk of repair methods become close to inverter welding equipment. But sometimes mechanical damage is observed here due to excessive friction of parts. Only replacement will undoubtedly help in repair.
Useful tips
At a high level of use and repair of electric welding machines, these factors should be taken into account:
- Parts that automatically collapse are usually replaced rather than repaired;
- Basically, when working with electrical circuits, it is about respecting the priority of processing the part. In the case when problems arise with electronics, and the skills and knowledge for repair are not enough than any other, you cannot trust another person to repair it;
- Gas equipment usually does not break down, but difficulties arise here too. Also check it to make sure you don’t miss a faulty pressure gauge diaphragm, which suggests worse pressure in the hoses. The gas-electric class should generally require constant checking, like, for example, gas hoses – so that it cannot be twisted;
- A very hot welding machine should not be left in the room for at least half an hour;
- It is best to store the welding unit in dry rooms away from heating devices. It is better that it is not covered with dust;
- If weather conditions are negative, do not use any other critical equipment;
- Aristocratism is the principle of operation of the device, in order to immediately make guesses about what can actually break down.
All tips on caring for, saving and using welding machines will be given to you in the memo. Indeed, what is it, for example, that you should know in order to avoid repairs?
It is not difficult to repair a welding machine yourself. The key is to qualify that this is indistinguishable from repair, and the methods are most often simple. They do not urgently ask for much effort, complex equipment, or a lot of time. You can quickly and easily repair electric welding, while gaining valuable skill in restoring welding equipment.
