Production process of spiral tube The spiral steel pipe is made of strip coil as raw material,Often warm extrusion molding,Spiral seam steel pipe welded by automatic double-sided submerged arc welding process.(1) raw materials are steel rolls,Welding wire,Flux.Before putting in, we must go through strict physical and chemical tests.(2) strip head and tail docking,Arc welding with single or double wires,Automatic submerged arc welding is adopted after the steel pipe is rolled.(3) before molding,The strip passes through leveling, cutting and planing,Surface cleaning and conveying and bending treatment.(4) the electric contact pressure gauge is used to control the pressure of the oil cylinder on both sides of the conveyor,Ensure smooth conveying of strip steel.(5) using external control or internal control roller molding.(6) the weld gap control device is used to ensure that the weld gap meets the welding requirements,Diameter,The wrong edge quantity and weld gap are strictly controlled.(7) both internal and ext

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A thick and even copper wire is cut off half, and the resistance of the remaining part Resistance decreases by half resistance = material (length/cross-section area ),The length is reduced to the original 1/2,