How to adjust the transformer of welding machine

Electric welding machine is an indispensable and important equipment in modern industrial production, which is widely used in many fields such as construction, manufacturing and maintenance. Among them, transformer, as an important part of welding machine, plays a key role in regulating current and stabilizing voltage. In order to ensure welding quality and equipment safety, it is particularly important to master the adjustment method of welding machine transformer.

First, the basic principle of welding machine transformer

Welding machine transformer is a special step-down transformer, whose main function is to convert the input high-voltage alternating current into low-voltage and high-current suitable for welding. The primary winding of the transformer is connected to the power supply, and the secondary winding is connected to the welding circuit. By adjusting the structure or parameters of the transformer, the output current can be controlled to meet the requirements of different welding materials and processes.

Second, the purpose of regulating the welding machine transformer

The core purpose of regulating the transformer of electric welding machine is to control the welding current according to the material, thickness and welding mode of welding workpiece (such as flat welding, vertical welding and overhead welding). Proper current can improve the welding quality, avoid problems such as incomplete welding, burn-through, excessive splashing, etc., and also prolong the service life of equipment and ensure the safety of operators.

Three, the adjustment method of welding machine transformer

1. Adjust the winding turns ratio

The output current of transformer is closely related to the turns ratio of primary and secondary windings. By changing the number of turns of the primary or secondary coil, the output current can be roughly adjusted. Generally, the primary winding has multiple taps. By switching different tap positions, the input voltage can be changed, thus adjusting the output current. This method is suitable for a wide range of current adjustment.

2. Adjust the position of the moving iron core

Some electric welding machines use moving iron core transformer, which changes the reluctance of magnetic circuit by adjusting the position of iron core, thus affecting inductance and output current. This method is smooth, suitable for fine adjustment of current, and is often used in AC welding machines.

3. Use an external reactor

In some cases, the current can be adjusted by connecting a reactor in the secondary circuit. The reactor can limit the rising speed of current, make the welding process more stable and help to adjust the continuity of welding current.

4. Adjustment of digital control system

Modern inverter welding machine mostly adopts digital control technology, and the working frequency and duty ratio of inverter are controlled by microprocessor, so as to realize high-precision current regulation. This method has the advantages of convenient adjustment, fast response and stable welding quality, and is suitable for occasions requiring high welding accuracy.

IV. Matters needing attention during adjustment

When adjusting the transformer, the operator should pay special attention to the following points:

-cut off the power supply before adjustment to ensure safety;
-Select appropriate current parameters according to welding materials;
-Avoid frequent adjustment and prevent equipment from overheating and damage;
-Regularly check the insulation and wiring of the transformer to ensure the normal operation of the equipment.

V. Conclusion

To sum up, the reasonable adjustment of welding machine transformer is very important for the quality and efficiency of welding work. Whether it is traditional moving iron core adjustment or modern digital control mode, mastering the correct adjustment method is one of the basic skills that welders must have. Through scientific adjustment, not only the welding quality can be improved, but also the service life of the equipment can be effectively extended and the operation safety can be guaranteed. Therefore, it is of great significance for welding personnel to strengthen the study and practice of transformer regulation knowledge of electric welding machine.