1. Use a power supply with straight external characteristics, and use positive polarity for DC (welding wire is connected to the negative pole).
2. It is generally suitable for welding thin steel pipes below 6mm. It has the characteristics of beautiful welding seam formation and small welding deformation.
3. The maintenance gas is argon with a purity of 99.99%. When the welding current is 50~50A, the argon gas flow is 8~0L/min; when the current is 50~250A, the argon gas flow is 2~5L/min.
4. The protruding length of the tungsten electrode from the gas nozzle is preferably 4~5mm. In places with poor shielding such as fillet welding, it is 2~3mm. In places with deep grooves, it is 5~6mm. The distance from the nozzle to the operation is normal. Do not cross 5mm.
5. In order to prevent the occurrence of welding pores, the welding parts must be cleaned if there is rust, oil, etc.
6. The welding arc length is preferably 2~4mm when welding thick and shallow steel, and ~3mm when welding stainless steel. If it is too long, the maintenance effect will be poor.
7. When priming for butt jointing, in order to prevent the backside of the bottom weld bead from being oxidized, gas protection is also required on the backside.
8. In order for the argon gas to protect the welding pool well and facilitate the welding operation, the center line of the tungsten electrode and the workpiece at the welding location should generally be connected at an angle of 80~85°, and the angle between the filler wire and the surface of the workpiece should be as small as possible. Generally assigned to 0°.
9. Windproof and ventilated. In windy places, be sure to use net blocking methods, while indoors you should use appropriate ventilation methods.
