Welded steel pipe: A steel pipe produced by welding a steel plate or a strip of steel into a cylindrical shape. According to the welding method, it can be divided into arc welded pipe, high frequency or low frequency electric resistance welded pipe
, gas welded pipe, furnace welded pipe, etc.; according to the weld form, it can be divided into straight welded pipe and spiral welded pipe.
Seamless steel pipe
: Seamless steel pipe is a round, square and rectangular steel with a hollow section and no joints around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical section steel which is widely used for manufacturing structures. Parts and mechanical parts, such as oil drill pipes, automotive drive shafts, bicycle frames, and steel scaffolding used in construction.
It can be seen that the seamless steel pipe and the welded steel pipe are mainly different in the molding process. Generally welded steel pipes, such as tap water pipes, are usually welded by bending the flat plate. You can find a weld on the top; the coarser diameter is usually a spiral weld. The seamless steel pipe is generally formed by laminating molten steel in a molten state through a ring slit and then being subjected to a stretching process, so that there is no weld. In terms of performance, especially the pressure bearing capacity is greatly improved compared with welded steel pipes, so it is often used on high-voltage equipment.
Such as the piping connection of hydraulic equipment. The weld of the welded steel pipe is the weak link, and the quality of the weld is also the main factor affecting its overall performance. People who have lived in welded steel pipes in the north generally have experienced the experience of freezing water pipes or heating pipes in the winter. The places where the explosions are usually welded.