Spiral Steel Pipe put into the welded pipe set with strip, the multi roller rolling strip rolls up and gradually forms a circular tube opening gap adjustment, squeeze roller reduction, the weld gap control in 1-3mm, and make the ends of the electrode flush.
1.If the clearance is too large, the proximity effect is reduced, the eddy heat is insufficient, and the weld joint is not good, resulting in incomplete fusion or cracking.
2.If the clearance is too small, the adjacent effect increases, the welding heat is too large, resulting in the weld burning. Or the weld after extrusion, rolling, forming a pit, affecting the quality of weld surface.
3.When the two edges of the tube are heated to the welding temperature, the common metal grains are permeated and crystallized with the extrusion of the roller, and finally a solid weld is formed.
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