SSAW pipes often have some quality problems in production and use, which affect the normal use of some aspects. It needs spiral welded pipes to identify the quality. According to certain methods and performance tests, it can play a significant role in actual use. Then how to identify counterfeit spiral welded pipes: appearance often paralyses the face. Generally speaking, the whole scale will be better, mainly considering the problem of cumulative error and probability theory. If some of the above are insufficient, we welcome discussions on steel pipe knowledge and continuous progress and exchanges. Pock is caused by uneven defects caused by uneven surface of grooved spiral welded pipe. Because fake and inferior spiral welded pipe manufacturers have to pursue profits, rolling grooves are most often over the standard. Scars can easily be created on the surface.


Uniform composition of high quality spiral welded pipe. High tonnage cold shearing machine, the end surface of the cutting head is smooth and neat. Because of poor material quality and poor material quality, the first end surface after cutting is often defleshing, i.e. uneven and non-metallic luster. And because manufacturers of fake and inferior materials cut the head of the product, the head and tail will be a big ear. Diameter size fluctuation. Folding is formed on the surface of various spirally welded pipe folds, and this defect is usually found in the longitudinal direction of the whole product. The reason for the torture is that the fake and inferior manufacturers pursue high efficiency and reduce the amount too much, which results in the ears being rolled and folded. When bending, the products will crack and bend, and the spiral welding with high strength will decrease greatly. Easy to scratch.


The reason is that the manufacturer of inferior material is not equipped well, and it is easy to produce burrs and scratch the surface of spiral welded pipe. Deep scratches reduce the strength of seamless steel tubes. Easy to fold. The transverse ribs are thin and low. Sufficient dissatisfaction often occurs, because the manufacturer wants to achieve greater negative tolerance, reduce a few relatively large before completion, small iron size, transmission full dissatisfaction. It is easy to crack. The reason is that it is a blank adobe. There are many holes in the adobe. Because of the thermal stress in the cooling process, cracks appear after rolling.