Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a large diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter by using a blank of the same width. However, compared with the straight pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is low.
Large diameter or thick welded pipes are generally made directly from steel billets, while small welded pipe thin-wall welded pipes need only be welded directly by steel strips. Then after a simple polishing, the wire can be used. Therefore, most of the smaller diameter welded pipes are straight seam welded, and the large diameter welded pipes are mostly spiral welded.
Supplement: The welded pipe is welded with strip steel, so it has no seamless pipe height in its original position.
Welded pipe process
Raw material unwinding - leveling - end shearing and welding - looper - forming - welding - inside and outside bead removal - pre-correction - induction heat treatment - sizing and straightening - eddy current testing - Cut off - water pressure check - pickling - final inspection (strictly check) - packaging - Liaocheng Hongfu tube industry shipments.
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