1. The power supply with vertical external characteristics is adopted, and the positive polarity is adopted in DC (the welding wire is connected to the negative pole).
2. It is generally suitable for the welding of thin plates below 6mm, and has the characteristics of beautiful welding seam shape and small welding deformation.
3. The protective gas is argon with a purity of 99.99%. When the welding current is 50~50A, the argon gas flow is 8~0L/min, and 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. It is 2~3mm in places with poor shielding such as fillet welding, and 5~6mm in places with deep grooves. The distance from the nozzle to the working is generally not enough. more than 5mm.
5. In order to prevent the occurrence of welding pores, the welding parts must be cleaned if there is rust, oil pollution, etc.
6. The length of the welding arc is preferably 2~4mm when welding ordinary steel, and ~3mm when welding stainless steel. If it is too long, the protection effect will not be good.
7. In order to prevent the backside of the bottom weld bead from being oxidized, the backside also needs to be protected by gas.
8. 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 place should generally maintain an angle of 80~85°, and the angle between the filler wire and the surface of the workpiece should be as small as possible. Usually about 0°.
9. Windproof and ventilation. In windy places, be sure to take measures to block the net, and take appropriate ventilation measures indoors.