SAW steel pipe is divided into longitudinally welded submerged arc welded straight seam steel pipe L-SAW and spiral welded submerged arc welded spiral steel pipe H-SAW. L-SAW steel pipe has the UO forming method suitable for mass production, the bending roll method and the press machine method suitable for a large number of varieties.
JCOE molding method is a method between UO molding method and press machine method. Whether there is an expansion process at the end of the pressure has a great impact on the performance of the steel pipe, and whether the process is present is also one of the classification methods.
H-SAW is equivalent to spiral welded pipe, which is formed by forming a coiled steel plate into a spiral shape, and then welding the butt parts. In addition to the traditional method of forming and tack welding followed by SAW, in order to obtain high productivity and high quality steel pipes, two-step spiral welding of SAW in other production lines after tack welding can also be used.
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