What is the difference between high-frequency welded steel pipe and straight seam welded steel pipe

First, the properties of high-frequency welded steel pipe and straight seam welded steel pipe are different.

1. High-frequency welded steel pipe: After the hot-rolled coil is formed by the forming machine, the skin effect and proximity effect of the high-frequency current are used to heat and melt the edge of the tube blank, and the pressure welding is carried out under the action of the extrusion roller to realize the production of the product.

2. Straight seam welded steel pipe: including double-sided submerged arc welding straight seam welded steel pipe and high-frequency resistance welding. The English abbreviation of high-frequency resistance welding is erw. Submerged arc welding straight seam steel pipe is divided into UOE, RBE, JCOE steel pipe, etc. according to its different forming methods.

Second, the materials of high-frequency welded steel pipe and straight seam welded steel pipe are different.

1. High-frequency welded steel pipe: The steel pipe of high-frequency resistance welding has a different welding process from that of ordinary welded pipe. The weld is formed by melting the parent material of the steel strip body, and the mechanical strength is better than that of ordinary welded pipe.

2. Straight seam welded steel pipe: The materials of straight seam welded steel pipe mainly include Q195, Q215, Q345, and x42 pipeline steel series. According to the specified wall thickness, straight seam welded steel pipes are divided into ordinary steel pipes and thickened steel pipes. According to the form of the pipe end, the steel pipes are divided into threaded and non-threaded types.

Third, the characteristics of high-frequency welded steel pipes are different from those of straight seam welded steel pipes.

1. High-frequency welded steel pipes: smooth appearance, high precision, low cost, small weld excess height, which is conducive to the coating of 3PE anti-corrosion coating. The welding method of high-frequency welded steel pipes is significantly different from that of submerged arc welded pipes. Since welding is completed instantly at high speed, the difficulty of ensuring welding quality is much higher than that of submerged arc welding.

2. Straight seam welded steel pipes: The length of straight seam welded steel pipes is mainly divided into fixed length and non-fixed length, which is mainly based on customer requirements. The length is generally 6-14 meters. Large-diameter straight seam welded steel pipes may require two steel plates for rolling, which also forms double welds.