Welded steel pipe refers strip or plate bending round, square and other shapes and then welded into the surface jointed pipe. Welded steel pipes used in billet steel sheet or strip.

44

By welding methods classification

Can be divided into spiral welded steel pipe, welded steel pipe, stove pipe.
Spiral welded steel pipe: according to different welding methods can be divided arc welded pipe, high-frequency or low frequency electric resistance welded pipe, gas pipe, stove pipe, Bundy tubes.
Welded steel pipe: for oil drilling and machinery manufacturing.

Furnace pipe: used as the water and gas pipe, large diameter longitudinally welded pipes for high pressure oil and gas transportation, etc; spiral welded pipe used in oil and gas transportation, Piles, piers and the like.

Press seam shape classification

It can be divided into Longitudinal and spiral welded pipe.

Longitudinal: the production process is simple, high production efficiency, low cost, rapid development.
Spiral welded pipe: Longitudinal strength is generally higher than that, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different pipe diameters. However, compared with the same length of straight seam pipe, weld length of 30 to 100%, and lower production rate. Therefore, smaller diameter pipe is mostly a straight seam welding, large diameter spiral welded pipe for the most part.