Point 1: Power supply with vertical external characteristics, positive polarity for DC (welding wire connected to negative pole)

Point 2: It is generally suitable for welding thin plates below 6mm, and has a beautiful weld shape and small welding deformation characteristics.

Point 3: The protective gas is argon with a purity of 99.99%. When the welding current is 50-150A, the flow rate of argon gas is 8-10L/min; when the current is 150-250A, the flow rate of argon gas is 12-15L/min.

Point 4: The protruding length of the tungsten electrode from the gas nozzle is preferably 4-5mm, 2-3mm in places with poor shielding such as fillet welding, and 5-6mm in places with deep slots. The distance from the nozzle to the work is generally not more than 15mm.

Point 5: In order to prevent the occurrence of welding pores, if there is rust and oil stains on the welding parts, it must be cleaned.

Point 6: The welding arc length is preferably 2-4mm when welding ordinary steel. The welding arc length is preferably 1-3mm when welding stainless steel. If not so, the protection effect is not good.

During butt priming, in order to prevent the back side of the bottom weld bead from being oxidized, the back side also needs to be protected by gas.

Point 7: In order to make the argon gas well protect the welding pool and facilitate the welding operation, the center line of the tungsten electrode and the workpiece at the welding plate should generally maintain an angle of 80-85 degrees. The angle between the filler wire and the surface of the workpiece should be as small as possible, generally around 10 degrees.

Windproof and breathable. Where there is wind, please take measures to block the net, and take appropriate ventilation measures indoors.