Welded steel pipes are classified according to the shape of the weld

Can be divided into straight seam welded pipe and spiral welded pipe
Straight seam welded pipe
The production process is simple, the production efficiency is high, the cost is low, the development is fast.
Spiral welded pipe
The strength is generally higher than that of straight welded pipe, and welded pipes with larger diameters can be produced with narrower billets, and welded pipes with different diameters can also be produced with billets of the same width. However, compared with the straight seam pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is lower. Therefore, the smaller diameter welded pipe is mostly straight seam welding, and the large diameter welded pipe is mostly spiral welding.
Spiral welded steel pipes are divided into automatic submerged arc welded steel pipes and high-frequency welded steel pipes.
a, spiral seam automatic submerged arc welded steel pipe according to the pressure of the conveying medium is divided into two categories: A tube and B tube. Class A pipes are generally welded with ordinary carbon steel Q235, Q235F and ordinary low-alloy structural steel 16Mn, and Class B pipes are welded with Q235, Q235F, Q195 and other steels, which are used as low-pressure fluid conveying pipes
b, spiral seam high-frequency welded steel pipe Spiral seam high-frequency welded steel pipe, there is no unified product standard, generally using ordinary carbon steel Q235, Q235F and other steel manufacturing.