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Pipe welding temperature control techniques: steel for the steel into welded pipe, the multi-channel roll rolling, gradually rolled steel, formed with a circular tube opening gap, the adjustment squeeze roll reduction, make welding seam gap control in 1 ~ 3mm, and weld ends flush. The gap is too large, reducing the proximity effect is caused by lack of eddy heat weld together to produce crystal indirect incomplete fusion or cracking bad. The gap is caused by the proximity effect is too small increases, excessive heat welding, burning resulting weld; welds or extruded to form a pit after rolling, it affects the quality of the weld surface.

Steel manufacturers introduced: lack of heat when the input, the weld edge is heated up to a temperature of less than weld metal structure remains solid, the formation of incomplete fusion or penetration; when there is insufficient input heat, the heated weld edge than soldering temperature, resulting in over-burning or droplets, so that the weld formed Cave.