1. Use a power supply with vertical external characteristics, and use positive polarity for DC (the welding wire is connected to the negative pole).

2. It is generally suitable for welding thin plates below 6mm. It has the characteristics of beautiful welding seam shape and small welding deformation.

3. The protective gas is argon with a purity of 99.99 percent . When the welding current is 50-150A, the argon gas flow is 8-10L/min, and when the current is 150-250A, the argon gas flow is 12-15L/min.

4. The protruding length of the tungsten electrode from the gas nozzle is preferably 4-5mm. In places with poor shielding such as fillet welds, it is 2-3mm. In places with deep grooves, it is 5-6mm. The distance from the nozzle to the work is generally not More than 15mm.

5. In order to prevent the occurrence of welding pores, any rust, oil stains, etc. in the welding part must be cleaned.

6. The welding arc length is preferably 2~4mm when welding ordinary steel, and 1~3mm when welding stainless steel. If it is too long, the protection effect will be poor.

7. In order to make the argon gas well protect the welding pool and facilitate the welding operation, the center line of the tungsten electrode and the workpiece at the welding location should generally maintain an angle of 80-85 degree , and the angle between the filler wire and the surface of the workpiece should be as small as possible. Generally it is about 10 degree .

8. Windproof and ventilated. In windy places, be sure to take measures to block nets, and take appropriate ventilation measures indoors.