Welding Techniques for MIG Welding

2024-07-10

Maintain a welding wire rod extension of 1/4 to 3/8 inches (the length of welding wire protruding from the welding gun head).
Use small diameter welding wire when welding thin plates; When welding thick plates, large diameter welding wires and high current welding machines are used.
Use the correct welding wire to weld the workpiece. Stainless steel welding wire welding stainless steel, aluminum welding wire welding aluminum, steel welding wire welding steel.
Use the correct protective gas. Carbon dioxide is very suitable for welding steel, but when used to weld thin plates, the temperature may be too high. A mixture of 75% argon gas and 25% carbon dioxide gas should be used to weld thinner materials. Welding aluminum can only use argon gas. When welding steel, you can also use a mixture of three gases (helium+argon+carbon dioxide).
To achieve the best control of the weld bead, the welding wire should be kept directly aligned with the bonding edge of the melt pool.
When the welding operation is in an abnormal position (vertical welding, horizontal welding, overhead welding), a small molten pool should be maintained to achieve optimal control of the weld bead, and the smallest diameter welding wire should be used as much as possible.
Ensure that the size of the welding wire you are using matches the nozzle, liner, and drive roller.
Regularly clean the welding gun liner and drive rollers to ensure that there is no spatter at the welding gun mouth. If the welding gun mouth is blocked or the wire feeding is not smooth, replace it.
During welding, try to keep the welding gun straight to avoid wire feeding issues.
Use both hands simultaneously during welding operations to ensure the stability of the welding gun, and do so as much as possible. (This also applies to electrode welding, TIG welding, and plasma cutting)
Adjust the tightness of the welding wire spool and driving roller of the wire feeder to just enough for wire feeding, without being too tight.
When not in use, store the welding wire in a clean and dry place to avoid contamination that may affect the welding effect.
Use a DC reverse polarity DCEP power supply.
The drag (pull) welding gun technique can achieve deeper penetration and narrower welds. The gun pushing technique can achieve shallower penetration and wider weld seams.