Welded square tube narrow billet production of larger diameter welded structural steel pipe, you can also use the same width of billet in the production of different pipe diameter welded pipe. But compared with the same length of LSAW steel pipe, weld length by 30 ~ 100%, and the production speed is low.
Bigger or thicker in diameter welded pipe, generally made directly with steel billet, and small tube welding thin wall tube welding only need welding directly by steel belt. Then after a simple polishing, wire drawing is ok. As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded structural steel pipe for the most part adopts spiral welded
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