knowledge of Spiral welded pipe production and useful

Spiral welded steel pipeused in production and will often appear quality problem, affect the normal use, in some aspects need to be in the identification of the spiral welded pipe quality, according to certain way and the performance test, can have important role in practical use, so how to identify counterfeit method of the spiral welded pipe: appearance often have pitted surface phenomenon. In general the whole amount to match the effect will be better, mainly considering the cumulative error and probability theory to this problem. Above points if there are any deficiencies, please supplement, welcome everybody to discuss about the steel pipe knowledge, progress in the continuous communication. Textured was caused by worn groove with irregular spiral welded pipe surface uneven defects. Because want to pursuit of profit, and inferior spiral HanGuanChang home often appear groove rolling the overweight. Surface are prone to scarring.

High quality components uniform spiral welded pipe. Cold shearing machine high tonnage, cutting head end face smooth and neat, and shoddy material because the material is poor, cutting head end face often have meat, or uneven, and no metallic luster. And due to low and inferior material manufacturers cut head, end there will be a big handle. The diameter is volatile. Fold is formed on the surface of the spiral welded pipe line, this kind of defect often throughout the entire product longitudinal. Causes of fold is due to the pursuit of the false and inferior, high efficiency, large reduction, handle, when the next rolling produce folding, folding products will be cracking after bending, thick wall spiral welded pipe strength decreased. Easy to scrape.

Reason is false and inferior material factory equipment simple, easy to produce burr, scratch surface of spiral welded pipe. Deep scratches to reduce the strength of the seamless steel tube. Prone to fold. Transverse reinforcement and low. Often appeared phenomenon of discontent, because manufacturers to achieve big minus tolerance, finished product quantity of the previous way slants big, small iron type, groove filling. Easy to crack. Because its billet is adobe, adobe air, adobe in the process of cooling due to the effect of thermal stress, cracks, after rolling there is crack.