Quality spiral steel pipe Hebei Friends preferred Pipe Co., Ltd., the company's products have a large diameter spiral steel pipe, thick-walled spiral pipe, Q235B spiral steel, Q345B spiral steel pipe, corrosion spiral steel pipe insulation. Friends spiral is a strip coil for raw materials, often warm extrusion, with automatic double-wire submerged arc welding process double-sided spiral welded pipe joints. Friends spiral pipe production process: first with high-quality steel through rigorous physical and chemical testing. The strip head butt, single or double wire submerged arc welding wire, rolled in after using automatic submerged arc welding. Before forming the strip after a relatively flat, trimming, planing, surface cleaning delivery and crimping process. Using electrical contacts on both sides of the conveyor control cylinder under pressure to ensure smooth delivery of the strip. Weld gap control device to ensure that the weld between satisfy welding requirements, diameter, wrong side, weld gap have been strictly controlled. Within welding and soldering are used outside the United States Lincoln welding machine or twin-wire submerged arc welding, thereby obtaining a stable welding quality. After welding the weld have been continuous ultrasound and automatic detector automatically checks to ensure 100% coverage of non-destructive testing spiral weld. If defective automatic alarm and spray the tag, production workers in order to adjust the process parameters, and eliminate hidden dangers. The use of air plasma cutting machine will cut a single tube. Each batch of steel pipe should be carried out strict inspection system, inspection of weld mechanical properties, chemical composition, fusion status, pipe surface quality and after NDT inspection. Ensure pipe process qualified can be put into use. Spiral Pipe Material: There Q235B / Q345B / 20 # / L245 / L290 / L360 / L390 / L415 / L450 spiral steel pipe, etc. Uses: Widely used in water engineering, petrochemical industry, power industry, steel, dredging and drainage, irrigation, gas transport and so on.