LSAW Steel Pipe

    In the process of high-frequency welding steel pipe, the welding process and the control of process parameters, the placement of the induction coil and the position of the resistor have a great influence on the welding quality of the steel pipe weld.     1) Control of weld gap of steel pipe The steel strip enters into the welded pipe unit, which is formed by the forming roll, after the orientation of the guide roll, the round steel pipe blank with open gap is formed, and the squeezing amount of the squeezing roller is adjusted, ~ 3mm, and to keep the weld ends flush. Weld gap control is too large, will weld the weld caused by poor fusion or cracking; weld gap control is too small, due to excessive heat, resulting in weld burning, melting metal splash, welding quality of the weld . In this case,     2) The position of the induction coil should be placed on the same center line as the steel tube. The distance between the front end of the induction coi...

    Helical submerged arc welding (spiral) steel pipe is the full name of hsaw pipe, to the strip into the welded pipe unit, the multi-roll rolling, the strip gradually rolled up to form a circular tube with an open gap, adjust the reduction of squeezing roller so that the weld gap control in 1 ~ 3mm, and make both ends of the weld flush. Spiral welded pipe is formed by forming the material strip spiral molding, through internal and external submerged arc welding, thus producing different specifications of the spiral welded pipe.     Helical submerged arc welding (spiral) steel pipe has many advantages over other welded pipe:     (A)The pipe has two overlapping inner and outer spiral weld, play a role in increasing the rigidity, bearing pressure also increased accordingly.     (B)The use of submerged arc welding process, slag protection effect. Therefore, it has good impact toughness and low temperature performance.     (C)The us...