The inspection method of the welded steel pipe and its purpose

The straight seam welding tube is a kind of welding tube which is made of steel strip, then it will be machined into tube by welder. Before introducing the testing methods of the welded steel pipe, we should understand the type and application of the welded pipe in advance. The welded steel pipe can be divided into straight seam welded pipe and spiral welded pipe according to the welding form. If the identifying standard is application, it can be classified into general welded pipe, galvanized welded pipe, auto pipe, spiral welded pipe and so on. In addition, it can also be divided into simple section steel tube and complex cross section according to the section shape of welded pipe. The classification of simple section shape includes square steel tube and round steel tube. The complex section contains unequal hexagonal steel pipes, double-convex steel pipes and so on. Of course, steel pipe price of welded steel tube varies according to the use and purpose of the steel tube. As welded steel pipes have more simple manufacturing process and lower production cost, it is widely used in all walks of life.

The main testing method applied in the welding tube is using some physical phenomena to test whether the pipe can meet the requirements including magnetic method. But the magnetic test can only be used to test the defects of the surface of the welded steel pipe. Penetration test can be used to check whether magnetic and non-magnetic surfaces are defective or not while the method of radiation detection is mainly used to detect surface defects especially for the welded round steel pipe such as cracks. The last testing method is to detect the position of the defect. In a word, the welding tube usually requires a variety of testing methods to ensure the quality of the welded pipe.

In addition, the quality of welded steel pipe is closely linked with the price fluctuation of the welding tube. Of course, it is also related to the demand of the market. The more widely used welding pipes, the more expensive it is. The main application scope of welded steel pipe is petrochemical industry, power industry as well as urban construction. Steel pipe manufacturers should mater the basic knowledge about the welded steel pipe so that they can provide customers with more desirable products. Do you have any doubts about the welded steel pipe especially for the testing method and the application?