High frequency welding technology for high-frequency welded stainless steel pipe production has been 40 years of history, for welding stainless steel or relatively new technology, the economics of its production to more widely used in construction products decoration, household appliances and mechanical structures and other industries. Large power supply high-frequency welding of different material, diameter, wall thickness of the pipe to achieve a high welding speed. Compared with welding, it is TIG welding speed of more than 10 times the maximum speed, therefore, production of general-purpose stainless steel pipe with high productivity. Since high frequency welding speed is high, so the pipe is more difficult to remove the burr. At present, high frequency welding steel pipe not be chemical, nuclear industry accepted was one of the above reasons. High-frequency welding to weld various types of austenitic stainless steel pipe, the same time, the development of new steel grades and the progress of forming welding can weld ferritic stainless steel pipe and other steel AISI409.