WHAT METHOD OF SPIRAL STEEL PIPE WELD PROCESS IS?

1. If the gap is too large, the effect of cuts constituting nearby, eddy current lack of heat, weld crystal adverse indirect co-occurrence of incomplete fusion or cracking.
2. The gap is too small, the effect is increased near constitute, excessive heat welding to form weld burning; perhaps weld by kneading, rolling after composing pit, affecting the quality of the weld surface of the tube two after marginal heated to welding temperature at kneading roll kneading, together constitute the metal grain mutual penetration, crystallization, ending constitute strong weld. If the spiral steel kneading force is too small, together constitute the number of crystals is small weld metal strength decreases, cracking may occur after the force; if kneading force is too large, will make the molten metal is extruded weld situation, not only reduces the weld strength, and the list will be a lot of glitches, and even take the welding seams constituting other shortcomings.