ERW high-frequency welded pipe
is a hot-rolled coil that is formed by a forming machine. The skin effect and proximity effect of high-frequency current are used to heat and melt the edge of the tube blank. Pressure welding is carried out under the action of squeeze roller to realize the produced product.
ERW high-frequency welded pipes are different from ordinary welded pipes. The weld is formed by melting the base material of the steel strip body, and its mechanical strength is better than that of ordinary welded pipes. Smooth appearance, high precision, low cost and small weld reinforcement, which is beneficial to the coating of 3PE anticorrosive coating
. The welding methods of high frequency welded steel pipe and submerged arc welded pipe are significantly different. Since welding is completed instantly at high speed, it is much more difficult to ensure welding quality than submerged arc welding.
The advantage of this processing technology of ERW high-frequency welded pipe is that there is a heat treatment process after welding, which eliminates the residual stress of the weld and heat-affected zone, refines the grain, and the heat-affected zone of the weld is small, and the heating speed is fast, which can greatly increase the welding speed. And the quality of the welding seam, and the strip steel that has not been pickled, shot blasted and trimmed can be used as the billet. At the same time, it can weld alloy steel, high alloy steel and non-ferrous metal pipes, which greatly reduces the unit power consumption. It can be produced with a set of welding equipment various high-frequency welded pipes.
But at the same time for the high-frequency welded pipe unit, the larger the diameter, the more it is restricted by the weight and wall thickness of the strip steel material. The storage equipment is limited by the spiral looper. In addition, the high-frequency welded pipe unit has a higher linear speed, and the buried The speed of arc welded pipe is generally 3m/min, which does not match each other. Therefore, the high-frequency welded pipe unit needs to fully utilize and expand its advantages in order to improve product quality and develop new products.