Precautions for stainless steel pipe welding:

 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).

2. Stainless steel pipe is generally suitable for the welding of thin steel pipe below 6mm, with the characteristics of beautiful weld formation and small welding deformation.

3. The shielding gas is argon with a purity of 99.99 percent. When the welding current is 50 ~ 50a, the argon flow is 8 ~ 0l / min, and when the current is 50 ~ 250A, the argon flow is 2 ~ 5L / min.

4. The length of tungsten electrode protruding from the gas nozzle is preferably 4 ~ 5mm. It is 2 ~ 3mm in places with poor masking such as fillet welding and 5 ~ 6mm in places with deep groove. The distance from the nozzle to the working is generally not more than 5mm.

5. In order to prevent the appearance of welding pores, the welding parts must be cleaned if there is rust, oil stain, etc.

6. For the length of welding arc, 2 ~ 4mm is preferred when welding ordinary steel, and ~ 3mm is preferred when welding stainless steel pipe. If it is too long, the result is not good.

7. During butt backing, in order to prevent the back of the underlying weld bead from being oxidized, the back also needs to be protected by gas.

8. In order to protect the welding pool well with argon and facilitate the welding operation, the intermediate line of tungsten electrode and the workpiece at the welding position shall be generally connected at an angle of 80 ~ 85 °, and the included angle between filler wire and workpiece profile shall be as small as possible, generally at the mercy of 0 °.

9. Windproof and ventilation. In windy places, be sure to adopt the method of blocking the net, and in rooms, appropriate ventilation methods should be adopted.