1. Use a power supply with straight external characteristics. For DC, use positive polarity (the welding wire is connected to the negative pole).
2. Generally suitable for welding 108*3 stainless steel pipes, it has the characteristics of beautiful welding seam shape and small welding deformation.
3. The maintenance gas is argon with a purity of 99.99%. When the welding current is 50~50A, the argon gas flow is 8~0L/min; when the current is 50~250A, the argon gas flow is 2~5L/min.
4. The length of the tungsten electrode protruding 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 workpiece is generally not more than 5mm.
5. In order to avoid the appearance of welding pores, the welding parts need to be cleaned if there is rust, oil, etc.
6. The welding arc length is preferably 2~4mm when welding general steel, and ~3mm when welding stainless steel. If it is too long, the protection effect will be poor.