Pre-bending quality control of
ssaw steel pipe for piling is on both sides of the steel sheet bending quality, including: after pre-bending bending radius edge of the plate reaches a radius of piling pipe; both sides of the curved equal to the width consistent degree of bending, symmetrical parallel, parallelism specified the range; within the scope of pre-bending radius of curvature of each point in a predetermined, and everywhere along the board edge in the same direction; pre-bent plate edge does not exist after the chicane, there was no wave shape, straightness within a predetermined range.
Preflex piling pipe production line is one of the primary process, the purpose is to complete both sides of the plate pre-bending, bending radius on both sides of the steel sheet at or near the radius of the steel pipe production specifications, thus ensuring the geometry and dimensions of spiral steel pipe weld area accuracy. If there is no pre-bending in the UOE molding, O-molding press, even when the compression ratio has been about 1% of the steel edges will still be straight section, resulting tube was formed after the beak Peach, subsequent to the pre-weld seam trouble, can lead to the wrong side or welding burn, even after expanding, it can not be eliminated, and also damage the enlarged diameter head.
