Welding Points of Large Diameter Stainless Steel Pipe

Welding points of large diameter stainless steel pipe:
1. Large diameter stainless steel pipe with vertical external characteristics of the power supply, DC with positive polarity (wire connected to the negative).
2. Generally suitable for welding below 6mm sheet, with weld appearance, welding deformation of small features.
3. The shielding gas is argon and the purity is 99.99%. When the welding current is 50-50A, the argon flow rate is 8-0L / min, when the current is 50-250A, the argon flow is 2-5L / min.
4. The length of the tungsten protruding from the gas nozzle is preferably 4-5 mm, and the area where the wiping is poor is 2-3 mm, 5-6 mm in the deep groove, and the distance from the nozzle to the working distance is generally not more than 5mm.
5. To prevent the emergence of welding holes, large diameter stainless steel pipe welding parts such as rust, oil, etc. must be clean.
6. Welding arc length, welding ordinary steel to 2-4mm is better, and welding stainless steel tube to 3mm is better, too long to protect the effect is not good.
7. In order to prevent the backside of the bottom bead from being oxidized, the back side also needs to carry out the gas protection.
8. In order to make the argon gas well to protect the welding pool and to facilitate the welding operation, the tungsten center line and the welding part of the workpiece should generally maintain 80-85 ° angle, fill the welding wire and the workpiece surface angle should be as small as possible, Generally about 0 °.
9. Wind and ventilation. There is a windy place, need to take the network to reduce the wind attack, and in the room should be taken appropriate.