1. The power supply adopts the vertical external characteristic, and the positive polarity is used in the direct current (the welding wire is connected to the negative electrode).
2. It is generally suitable for the welding of stainless steel nuts of thin plates of 6mm or less. It has the characteristics of beautiful weld bead formation and small welding deformation.
3. The shielding gas is argon with a purity of 99.99%. When the welding current is 50-150A, the argon flow rate is 8-10L/min, and when the current is 150-250A, the argon flow rate is 12-15L/min.
4. The length of the tungsten electrode protruding from the gas nozzle is preferably 4-5mm, 2-3mm in the place where the shielding property such as fillet welding is poor, and 5-6mm in the deep groove, the distance from the nozzle to the working is generally not More than 15mm.
5. In order to prevent the occurrence of welding vents, the welding parts must be cleaned such as rust and oil.
6. Welding arc length, when welding ordinary steel, 2~4mm is better, while welding stainless steel is better than 1~3mm. If it is too long, the protection effect is not good.
7. In order to make the stainless steel nut argon protect the weld pool well and facilitate the welding operation, the tungsten center line and the welding workpiece should generally maintain an angle of 80-85°, and the angle between the filler wire and the workpiece surface should be as much as possible. Small, usually around 10°.
8. In order to make the argon gas protect the weld pool well and facilitate the welding operation, the tungsten center line and the welding workpiece should generally maintain an angle of 80-85°, and the angle between the filler wire and the workpiece surface should be as small as possible. Usually about 10 °.
9, wind and ventilation. In windy places, take measures to block the net, and indoors should take appropriate ventilation measures.