Precautions for welding of 304 stainless steel pipe

　　Precautions for welding of 304 stainless steel pipe are as follows:

　　1, The use of vertical external power supply, DC positive polarity (wire connected negative).

　　2, Generally suitable for the welding of sheet 6mm below, with the appearance of weld appearance, welding deformation of a small amount of features.

　　3, The protective gas is argon, purity of 99.99%. When the welding current is 50 ~ 50A, argon flow rate is 8 ~ 0L / min, when the current is 50 ~ 250A, argon flow rate is 2 ~ 5L / min.

　　4, Tungsten protruding from the gas nozzle to the length of 4 ~ 5mm is better, in the fillet welding and other poor shielding is 2 ~ 3mm, deep groove where it is 5 ~ 6mm, the nozzle to the work of the general distance more than 5mm.

　　5, In order to prevent the emergence of welding pores, weld rust, oil, etc. must be cleaned.

　　6, The welding arc length, welding ordinary steel, preferably 2 ~ 4mm, and welding stainless steel to ~ 3mm is better, too long, the protection is not good.

　　7, The docking base, in order to prevent the back of the bottom weld is oxidized, the back also need to implement gas protection.

　　8, In order to make the argon well protect the welding pool, and to facilitate the welding operation, the tungsten centerline and welding workpieces should generally maintain 80 ~ 85 ° angle, filler wire and workpiece surface angle should be as small as possible, Generally 0 & deg; left and right.

　　9, Wind and ventilation. Windy areas, be sure to take the measures to block the network, while indoors should take appropriate ventilation measures.