Characteristics of if bend pipe

　　1 if the frequency of the use of vertical and external characteristics of the power supply, DC, the use of positive polarity (welding wire electrode)

　　2 if the elbow is generally suitable for the welding of 6mm sheet metal, has the characteristics of weld appearance, small welding deformation.

　　3 the 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 rate is 2~5L/min.

　　4 welding arc length, welding of ordinary steel, the 2~4mm is better, and the welding of stainless steel, to ~3mm for the best, too long, the protective effect is not good.

　　5 if pipe to prevent welding holes appear, welding parts such as rust, oil, make sure clean.

　　6 tungsten electrode from the gas nozzle to highlight the length of the 4~5mm is better, in the corner welding, such as poor shelter is 2~3mm, in the deep groove depth is 5~6mm, the nozzle to the working distance is generally not more than 5mm.

　　7 If pipe docking base, in order to prevent the bottom bead back is oxidized back, also need to carry out gas protection.

　　8 wind and ventilation. Where there is wind, please take the measures to stop the network, and the appropriate ventilation measures should be taken in the room.

　　9. If bending for argon to make good protection of welding molten pool and facilitate welding operation, tungsten electrode center line and welding work piece should remain generally 80 ~ 85 degrees, filling should be small as possible for the angle between the wire and the work piece surface, usually around 0 degrees.