As we all know, the quality of square tube machine
is very important in the process of using. Let's talk about the good and bad quality of the square tube machine.
1. The fake square tube machine is easy to fold. Folding is a variety of fold lines formed on the surface of square tube, and this kind of defect often runs through the longitudinal direction of the whole product. The reason for folding is that the fake and inferior manufacturers pursue high efficiency, the reduction is too large, the ears are produced, the folding occurs in the next rolling, the folded products will crack after bending, and the strength of the steel will be greatly reduced.
2. The appearance of the fake square tube machine is often pockmarked. Pockmarked surface is a kind of irregular uneven defect on the surface of steel due to the serious wear of rolling groove. Because the fake square tube manufacturers want to pursue profits, and often the rolling groove exceeds the standard, it is necessary to select the equipment with better quality than the pipe welding machine.
3. There are two reasons for scab on the surface of fake square tube:
(1) The material of the fake square tube is uneven, and there are many impurities.
(2) It is easy to stick steel because of the poor guide equipment of the fake factory.