Weld joint treatment of spiral pipe

Spiral Pipe is a strip coil for raw materials, often warm extrusion, with automatic double-sided submerged arc welding process wire spiral welded pipe joints.

Spiral steel pipe into the steel unit, the multi-channel roll rolling, gradually rolled steel, formed with an opening gap of a circular tube, adjust the amount of reduction squeeze rollers, the weld gap control 1 - 3mm, and weld ends flush.

  1. If the gap is too small, the proximity effect caused by increasing welding heat is excessive, causing burning weld; welds or extruded to form a pit after rolling, affecting the quality of the weld surface.
  2. If the gap is too large, resulting in reduction of the proximity effect, lack of vortex heat weld together to produce crystal indirect fusion or cracking are not bad.After the two edges of the tube is heated to welding temperature at squeezing rollers squeeze, a common metal grains mutual penetration, crystallization, eventually forming a solid weld. If the spiral pipe extrusion pressure is too small, the number of co-crystals form small, weld metal strength decreases, will produce after cracking force; if the pressing force is too large, will make molten weld metal is extruded, not only reduces the weld strength, and will generate a lot of internal and external burrs, and even cause defects such as welding seam ride.

In the molding process, the steel deformation even small residual stress, surface does not produce scratches. Spiral pipe machining diameter and wall thickness in the range of sizes greater flexibility, especially in the production of high-grade steel thick-walled pipes, especially small and medium-diameter thick-walled tube aspect has the incomparable advantage of other technology, users can meet In the spiral pipe specifications more demanding. The use of advanced double-sided submerged arc welding process, can be implemented in the best position welding, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control weld quality.

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Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.


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