Spiral pipe welding head

Such as spiral steel pipe weld gap is too large, the composition of the wound near the lack of hot eddy currents, weld crystallization indirectly symbiotic cracks or lack of integration; if the gap is too small, the effect is to increase the near formation of excessive heat welding weld Combustion; maybe weld kneading, pit formed after rolling, affecting the pipe weld surface quality, heated to the edge of the two welding temperature, kneading, together constitute the mutual penetration of metal grains, crystallization, spiral pipe weld The amount of crystals that make up the weld together is too small, the strength of the weld metal is reduced, cracks may occur after they have taken effect, and if excessive force of kneading results in the molten metal squeezing the weld, not only Lowering the strength of the weld, and the list will be a big problem, even taking the disadvantage of a welded seam.