Spiral steel pipe is a spiral seam steel pipe made of strip coil plate, extruded by constant temperature and welded by automatic double-wire submerged arc welding. The spiral steel pipe will send the strip into the welding pipe unit, roll through the multi-channel roll, the strip gradually rolled up to form a circular tube blank with an open gap, adjust the pressure of the extrusion roll, so that the weld gap is controlled in 1~3mm, and the two ends of the welding joint are flush.
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