Welding points of stainless steel welded pipe

Welding points of stainless steel welded pipe

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

2. It is generally suitable for welding thin plates below 6mm, and has the characteristics of beautiful weld 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 flow rate of argon gas is 8~0L/min, when the current is 50~250A, the flow rate of argon gas is 2~5L/min.
4. The protruding length of the tungsten electrode 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 where the slot is deep. 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 parts, it must be cleaned up

6. The welding arc length 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. When butt bottoming, in order to prevent the back of the bottom weld bead from being oxidized, the back 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 centerline 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, generally about 0°.
9. Windproof and ventilation. Where there is wind, please take measures to block the net, and take appropriate ventilation measures indoors.