If the gap between the welds of spiral steel pipe is too large, the cutting effect is formed nearby, the eddy current is lack of heat, and the welding crystals are not favorable for indirect co-occurrence of cracks or lack of fusion; if the gap is too small, the effect of the nearby composition will increase, and the welding seam will be burned by overheating welding; perhaps by kneading welding, after rolling into pits, the quality of the welded pipe surface will be heated to two welding temperatures at the edge, and kneading under the kneading roll. If the strong kneading force is too small and the number of crystals is too small, the strength of weld metal decreases, and cracks may occur after the stress is applied; if the kneading force is too large, the extrusion welding of molten metal will not only reduce the welding strength, but also many burrs, and even make the weld seam form a defect. Point.


Spiral steel packaging device is used to transport or protect the external spiral steel pipe from corrosion. Generally, spiral pipe packaging is used for the export of spiral steel pipe. Spiral pipe is mainly for export shipping, so as to facilitate loading and unloading. Generally used for packaging, packaging spiral tube is divided into the following forms: 1. baling, that is, binding formula, for example, spiral 219,7 bundles, spiral 273 bundles 7. Each is tied at both ends with a sling for easy lifting. 2. Box packing is to use angle steel, square pipe, welded into box channel, open it, and handle the whole box directly as the size of the container and loading and unloading.