There are some points of SEAMLESS PIPE welding:
1. Adopt the power supply with vertical external characteristics, and adopt the positive polarity (welding wire is connected to the negative electrode) when DC.
2. It is generally suitable for the welding of thin plates under 6mm, with the characteristics of beautiful weld forming and small welding deformation.
3. The shielding gas is argon with purity of 99.99%. 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 the tungsten electrode protruding from the gas nozzle is 4-5mm, 2-3mm in places with poor shielding such as fillet welding, 5-6mm in places with deep groove, and the distance from the nozzle to the work is generally no more than 5mm.
5. In order to prevent the occurrence of welding pores, the welding parts, such as rust, oil, etc., must be cleaned.
6. When welding ordinary steel, 2-4mm is better, while when welding stainless steel, ~ 3mm is better. If it is too long, the protection effect is not good.
7. When butt backing, 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 argon protect the welding pool well and facilitate the welding operation, the angle between the tungsten electrode center line and the workpiece at the welding position shall be generally kept at 80-85 °, and the angle between the filler wire and the workpiece surface shall be as small as possible, generally about 0 °.
9. Wind prevention and ventilation. In windy places, please take measures to block the net, and take appropriate air change measures indoors.
