Common methods of inspecting the quality of spiral pipes from appearance
When many users buy a spiral tube, because there is no professional testing equipment, at this time, the quality of the spiral tube can only be detected from the appearance. The following are several common judgment methods.
1. From the surface of the spiral tube, is the manufacturing process of the spiral tube exquisite? Generally speaking, a good spiral steel tube? The company will be careful in production, and there will be no friction defects. The cross section of the fake and inferior spiral steel pipe is oval. The reason is that in order to save materials, the reduction amount of the first two passes of the finished roll is too large. The composition of high-quality steel is uniform, the tonnage of the cold shearing machine is high, and the end surface of the cutting head is smooth and tidy. However, due to the poor material of the fake and inferior material, the end surface of the cutting head often has the phenomenon of meat loss, that is, unevenness and no metallic luster. And because the products of the fake and inferior material manufacturers have less cutting heads, there will be big ears at the head and tail.
Common methods of inspecting the quality of spiral pipes from appearance
2. To beat the metal steel pipe, if the sound is very brittle and the echo is not very dirty, then the name spiral steel pipe is the latest choice, not the waste spiral pipe recycling.
3. The appearance inspection of welded joints is a simple and widely used inspection method. It is an important part of finished product inspection, mainly to find defects on the surface of the weld and deviations in size. Generally, inspection is carried out by naked eye observation with the help of standard templates, gauges and magnifying glasses. If there is a defect on the surface of the weld, there is a possibility of a defect inside the weld.