The spiral steel pipe feeds the strip into the welding tube unit, and after rolling with multiple rollers, the strip is rolled up gradually to form a round tube billet with an open gap. The reduction amount of the extrusion roll is adjusted to control the gap of the welding seam within 1~3mm and make both ends of the welding seam flush.1. If the gap is too large, the adjacent effect will be reduced, the eddy current heat will be insufficient, and the weld crystals will not fuse or crack due to poor indirect bonding.2. If the gap is too small, the adjacent effect will increase, and the welding heat will be too large, resulting in the loss of welding seam;Or deep pits may be formed after the weld is extruded or rolled, affecting the surface quality of the weld.After heating the two edges of the billet to the welding temperature, under the extrusion of the extrusion roller, the common metal grains permeate and crystallize each other, and finally form a solid weld.If the extrusion pressure of spiral steel tube is too small, the number of common crystals will be small, the strength of weld metal will decrease, and cracking will occur after being stressed.If the extrusion pressure is too high, the molten metal will be squeezed out of the weld, which not only reduces the strength of the weld, but also produces a lot of internal and external burrs, and even causes defects such as welding lap joints.
Cangzhou Steel Pipe Group (CSPG) Co., Ltd
Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.
Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects
Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555
Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners