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2. It is generally suitable for the welding of thin sheets below 6mm. It has the characteristics of beautiful weld appearance 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 rate is 8~0L/min. When the current is 50~250A, the argon flow rate is 2~5L/min.
4. The length of the tungsten electrode protruding from the gas nozzle is preferably 4~5mm. It is 2~3mm where the shielding property such as fillet welding is poor, and 5~6mm when the groove is deep. The distance from the nozzle to the work is generally not more than 5mm.
5. In order to prevent the occurrence of welding porosity, rust, oil, etc. must be removed from the welding area.
6. Welding arc length, when welding ordinary steel, 2~4mm is preferable, and when welding stainless steel, ~3mm is preferable, and if it is too long, the protection effect is not good.
7. When the bottom of the docking is in order to prevent the back of the bottom bead from being oxidized, the back side also needs gas protection.
8. In order to make argon well protect the welding pool, and to facilitate the welding operation, the center line of the tungsten electrode and the workpiece at the welding site should generally maintain an angle of 80~85°. The angle between the filler wire and the workpiece surface should be as small as possible. It is generally around 0°.
9. Wind and ventilation. Where there is a wind, please take measures to block the net, and take appropriate ventilation measures indoors.
Stainless steel pipe welding points and matters needing attention
Stainless steel pipe welding points and matters needing attention 1. Using vertical external power supply, DC positive polarity (wire negative electrode).