Key points of stainless steel pipe welding
1. Use a power supply with vertical external characteristics, and use positive j when DC (welding wire connects to negative j).
2. Generally suitable for welding thin plates below 6mm, with 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 flow is 8~0L/min, when the current is 50~250A, the argon flow is 2~5L/min.
4. The protruding length of tungsten j from the gas nozzle is preferably 4~5mm, 2~3mm for fillet welding and other places with poor shielding, and 5~6mm for deep grooves. The distance from the nozzle to the work is generally not More than 5mm.
5. In order to prevent the appearance of welding pores, if there is rust and oil stains on the welding part, it must be cleaned up.
6. For welding arc length, 2~4mm is better when welding ordinary steel, and ~3mm is better when welding stainless steel. If it is too long, the protection effect will not be good.
7. In order to prevent the back surface of the bottom weld bead from being oxidized, the back surface also needs to be protected by gas.
8. In order to protect the welding pool with argon gas and facilitate the welding operation, the center line of tungsten j and the workpiece at the welding point 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. It is generally about 0°.
9. Windproof and ventilation. In windy places, be sure to take measures to block the net, while indoors should take appropriate ventilation measures.