Arc welding: it is used for arc welding of straight seam steel pipes. It has good maintainability, good welding high temperature performance, good physical properties, aluminum alloy parts are not easy to burn, high connection index, good welding formability, no slag shell, and smooth surface. At present, the manual argon tungsten arc welding market is mainly used for argon arc welding of 0.5~3mm stainless steel plates.

In the process of manufacturing and using welded pipe, nondestructive testing to ensure weld quality is particularly important. The common nondestructive testing methods for welded pipes are: ultrasonic testing, off-line magnetic flux leakage testing and eddy current testing; Ultrasonic flaw detec

Penetrant testing (abbreviated as PT) is a nondestructive testing method for inspecting surface opening defects based on the principle of capillary action. This method is one of the five conventional nondestructive testing methods and is a comprehensive science and technology.