Welding seam is an important symbol of welded pipe quality and the life of the welded pipe. Therefore, analysis and treatment of welding section quality defects should be carried out around the welded seam. The main defects of the welded seam include weld cracks, cracks, incomplete penetration, overburning and perforation, Dislocation of welds, etc.

Hot-rolled seamless pipe is an ultra-thin, strong, detailed and stable chromium-rich oxide film (protective film) formed on its surface to prevent oxygen atoms from re-wetting and re-oxidizing, thereby obtaining professional anti-corrosion ability.

Tube billet is the billet for the production of seamless steel pipes, and the most widely used in my country are round continuous casting billets and rolling billets. According to the production method of tube billet, it can be divided into: ingot, continuous cast billet, rolled billet, segment billet and hollow cast billet.

The following principles can be followed to minimize the occurrence of welding deformation.1. Do not over solder, 2. Intermittent weld, 3. Welding sequence, 4. Removal of shrinkage force after welding

The application range of seamless steel pipes is becoming wider and wider. In the whole process of applying seamless steel pipes, how should people keep the level of seamless steel pipes unchanged?

According to different production processes, seamless steel pipes can be divided into hot-rolled seamless steel pipes, hot-expanded seamless steel pipes, and cold-drawn seamless steel pipes. Four categories of cold-rolled seamless steel tubes.