According to the material, argon arc welding is generally selected. The main material for electric welding is carbon steel. If stainless steel is welded, bubbles will be generated. Of course, you can also choose to use stainless steel covered electrode welding, but the covered electrode composition should be as close as possible to the plate composition. As for the specifications of covered electrode, you should choose according to your pipe diameter and wall thickness, which are generally 2.5, 3.2 and 4.2.
Generally, the material used for steam pipes is 304 or 304L. When the pipe is formed, argon is generally used for electric welding, and the medium is protective gas, that is, argon. This kind of welding is relatively stable relative to arc, and the strength of welding liquid is good, so it is generally used for automatic welding.
Generally, electric welding is used for pipe butt joint, which is convenient for welding and has a good advantage for cracks in pipes with uneven cross section. Argon arc welding is generally used as an auxiliary in the construction site, and is mainly used for spot welding of thin plates.