Combination of a variety of welding stainless steel pipe welding method has its own advantages and disadvantages. How weaknesses, some welding methods will be combined to form a new welding process, and meet people on the stainless steel pipe of the quality and productivity requirements of the current stainless steel welded pipe technology development trends. After several years of exploration and research, portfolio progress has been made in welding technology, Japan, France and other countries of stainless steel welded pipe production has used some combination of welding technology. Combination of welding methods are: welding + plasma welding, high frequency welding + plasma welding, high frequency welding torch preheat + c, high-frequency welding preheat + plasma + welding and so on.