1. From the surface of the spiral steel pipe, you can see whether the production process of the spiral steel pipe is exquisite. Generally, it is necessary to research and analyze spiral steel. The cross-section of fake and inferior spiral steel pipes is oval. The reason is that the manufacturer saves raw materials and the reduction of the first two rollers of the finished product is slightly larger. The compressive strength of this spiral steel pipe is greatly reduced, and it does not meet the specifications of screw steel products. The high-quality spiral steel pipe has a symmetrical composition and high cold shearing tonnage, and the inner hole of the cutting head is smooth and neat. As for counterfeit and shoddy materials, due to the poor quality of these materials, frequent use of cutting holes will lead to unevenness and no metallic texture.
2. Knock the spiral steel pipe and listen to the sound after knocking. If the sound is crisp and the echo is not chaotic, it means that the spiral steel pipe is made of new material technology, rather than the comprehensive development and utilization of discarded spiral steel pipes.
3. Spiral steel pipe butt weld shape inspection is a detection mode with simple detection technology and universal application capabilities. It is an important part of finished product quality inspection. The key is to find defects and specification errors on the welding surface of spiral steel pipes. Generally based on human eye inspection, testing relies on special tools such as specification models, instruments, and high-magnification glasses. If there are defects on the welding surface, there will also be defects inside the welding.
Post time: Dec-19-2023