Nickel is a ferromagnetic metal element with excellent properties such as corrosion resistance, high temperature resistance, oxidation resistance and good ductility. It is widely used in metallurgy, chemical industry, aerospace and other fields. It is an important raw material for the preparation of stainless steel, high-temperature alloys, power batteries and other materials.

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