For a long time, the spiral steel pipe and the straight seam pipe have been debated for a long time, especially the question of who is superior compared with the UOE steel pipe. With the development of spiral steel pipe manufacturing technology today, we should evaluate and compare correctly, and re-understand the problem of long welding seam of spiral steel pipe. First of all, since the defect is parallel to the weld, for the spiral steel pipe, the defect of the weld is "oblique defect".​​

Not to mention how to use the spiral steel pipe for people in the steel pipe industry, some customers and other people may be a little confused, so this is to publish the information on the use of the spiral steel pipe on the Internet, and all the staff of the spiral steel pipe factory will share with you, in fact, understand The use of spiral steel pipe is very important.​​

The weld of the spiral steel pipe is longer than that of the straight seam pipe. If the pipe length is L, the weld length is Lcos. For a long time, the spiral steel pipe and the straight seam pipe have been debated for a long time, especially the question of who is superior compared with the UOE steel pipe. With the development of spiral steel pipe manufacturing technology today, we should evaluate and compare correctly, and re-understand the problem of long welding seams of spiral steel pipes. First of all, since the defect is parallel to the weld, for the spiral steel pipe, the defect of the weld is "oblique defect".​​

During use, the principal stress direction of the spiral steel pipe, that is, the equivalent defect length in the axis direction of the steel pipe is smaller than that of the straight seam pipe; The CVN value of the direction can be 3 times higher than the CVN value perpendicular to the rolling direction