1. From the surface of the
spiral steel pipe, see whether the production process of the spiral steel pipe is exquisite. It is generally necessary to study and analyze the spiral steel, and the section of the fake and inferior spiral steel pipe is oval. The reason is that the manufacturer saves raw materials, the reduction of the first two rolls of the finished product is slightly more significant, the compressive strength of this spiral steel pipe is greatly reduced, and it does not meet the specifications and dimensions of the screw steel product. The high-quality spiral steel pipe has symmetrical composition, high cold shear tonnage and the inner hole of the cutting head is smooth and tidy. However, due to the poor quality of fake and shoddy materials, the frequent use of cutting holes will cause unevenness and no metal texture.
2. Tap the spiral steel pipe and listen to the sound after hitting it. If the sound is very 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 waste spiral steel pipe.
3. Spiral steel pipe butt weld shape detection is a mode with simple detection technology and universal application ability. It is an important content of finished product quality inspection. The key is to find out the defects and specification errors of the welded surface of the spiral steel pipe. Generally, it is tested according to the human eye, relying on special tools such as specification models, meters, and high-magnifying glasses. If the welding surface is defective, the welding interior will also be defective.
