Stainless steel tube is the stainless steel tube inserted into the tube part and then along the tube edge of a circle of argon arc welding pipe, is the most reliable connection in all the way. Pipe diameter of pipe diameter = diameter of pipe. According to edge of the fitting welding part can be divided into slope Yanbian, step edge Yanbian and Yanbian three fittings, socket welding specification is generally DN15-DN100.