Welding Technology and Packaging Methods of Spiral Pipe
Update:
2017-01-05 View(s):
2349 Keywords :SSAW steel pipe ,Welded pipe
Such as spiral steel pipe weld gap is too large, the effect of cuts constituting nearby, eddy current lack of heat, weld crystal adverse indirect co-occurrence of cracks or lack of fusion; if the gap is too small, the effect is increased near constitute, excessive heat welding to form weld seam burning; perhaps weld by kneading, rolling after composing pit, affecting the quality of the weld surface of the tube is heated to a marginal two welding temperature, under kneading roll kneading, together constitute the metal grain mutual penetration, crystallization, ending spiral steel pipe welds constitute strong kneading force is too small if, together constitute the number of crystals is small, the weld metal strength decreases, cracking may occur after the force;. If kneading excessive force 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 seam constitute disadvantages.
Spiral steel packaging means for transportation or for the protection of the outer spiral steel pipe corrosion protection is performed generally spiral pipe packaging mainly for export for the spiral steel pipe, spiral pipe is mainly because exports go by sea, in order to facilitate loading and unloading generally for packaging, packaging spiral pipe is divided into the following forms: 1, bundle pack, which is bundling formula, for example, spiral pipe 219, 7 bundle, spiral pipe 273 7 bundle. Each bundle at both ends with a sling for easy lifting. 2, box packaging, is the use of angle steel, square tube, welded into a box-type channel, opening it, and the size of the container, like loading and unloading direct handling FCL.
