The blank used for welded steel pipes is steel or strip. The steel plate or strip is bent into a circular shape, a square shape, etc. by a manufacturing process, and then welded to form a welded steel pipe having a seam on the surface.
According to the welding method, our steel pipes can be divided into arc welded pipes, high frequency or low frequency electric resistance welded pipes, gas welded pipes, furnace welded pipes, etc.; according to the weld form, they can be divided into straight welded pipes and spiral welded pipes.
The welded steel pipe has a simple production process, high production efficiency, many varieties and specifications, and low investment cost. It can be used in water pipes, gas pipes, heating pipes, etc.
It has high precision, uniform wall thickness, high brightness inside and outside the pipe (the surface brightness of the steel pipe determined by the surface grade of the steel plate), and can be arbitrarily fixed. Therefore, it demonstrates its economy and aesthetics in high-precision, medium- and low-pressure fluid applications.
Welded steel pipes are widely used in long-distance pipelines such as natural gas, petroleum, chemical, electric power, heat, water supply and drainage, steam heating, pressure steel pipes for hydropower stations, thermal power generation, water sources, and piling, bridges, steel structures, etc.