The straight seam submerged arc welding pipe (LSAW) is generally made of steel plate as raw material, through different forming processes, using double-sided submerged arc welding and after welding to expand the diameter and other processes to form the welded pipe.
There are UO(UOE), RB(RBE), JCO (JCOE) and so on. The steel plate is first pressed into a U shape in the forming die, then pressed into an O shape, and then submerged arc welding is carried out inside and outside. After welding, expansion at the end or in the full length range is called UOE welded pipe, while non-expansion is called UO welded pipe. Roll Bending the steel plate, and then conduct internal and external submerged arc welding, expanding to RBE welded pipe or RB welded pipe without expanding. The steel plate shall be formed in the order of j-c-o-type, and the diameter shall be enlarged to JCOE welded pipe or JCO welded pipe without diameter enlargement after welding
Forming process of UOE submerged arc welding pipe:
Three main forming processes of UOE submerged arc welded steel pipe Include: Prebending of steel plate, U forming and O forming. Each process USES the special forming press, completes the steel plate edge prebending, U forming and O forming in turn, deforms the steel plate into a round tube.
JCOE straight seam submerged arc welding pipe forming process:
Forming: after several steps of stamping in JC0 forming machine, the first half of the steel plate into a "J,", shape, and then the other half of the steel plate into a "J" open to form a "C" shape, and finally from the middle of the pressure to form an open "0" shape tube blank.
