1. From the surface of the spiral steel pipe, see whether the production process of the spiral steel pipe is exquisite. Generally, it is necessary to study and analyze the spiral steel. The cross-section of the fake and inferior spiral steel pipe is elliptical. The reason is that the manufacturer saves raw materials, and the pressure 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 and dimensions of the screw steel products.
High-quality spiral steel pipes have symmetrical components, high cold shear tonnage, and smooth and neat inner holes of the cutting head. However, due to the poor quality of these materials, cutting head holes are often used, which will lead to uneven bumps and no metal texture.
2. Knock on 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 this spiral steel pipe is made of new material technology, rather than the comprehensive development and utilization of abandoned spiral steel pipes.
3. The shape detection of the butt weld of spiral steel pipes is a detection mode with simple detection technology and universal application ability. It is an important content of finished product quality detection. The key is to find out the defects and specification errors on the welding surface of the spiral steel pipe. Generally, it is tested based on human visual inspection, relying on special tools such as specification models, meters, and high-magnifying glasses. If there are defects on the weld surface, there will also be defects inside the weld.
Post time: Sep-09-2024