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THREE WELDING TECHNIQUES FOR STAINLESS STEEL WELDED PIPE

At present, the welding methods of stainless steel welded pipes used in the industry mainly include argon arc welding, high-frequency welding, plasma welding, and laser welding. Several welding methods have their characteristics. At present, argon arc welding and high-frequency welding are the most used.

  Stainless steel welded pipe technology-argon arc welding

  Stainless steel welded pipe requires deep penetration, no oxide inclusions, and the heat-affected zone are as small as possible. Tungsten inert gas shielded argon arc welding has good adaptability, high welding quality, and good penetration performance. Its products are used in the chemical industry. , Nuclear industry and food industry are widely used.

  Stainless steel welded pipe technology-high frequency welding

  Frequency welding has a higher power source and can reach a higher welding speed for steel pipes of different materials and outer diameter and wall thickness. Compared with argon arc welding, the welding speed is more than 10 times. Therefore, the production of general-purpose stainless steel pipes has higher productivity.

  Because of the high-frequency welding speed, it is difficult to remove the burrs in the welded pipe. At present, high-frequency welded stainless steel pipes are not yet accepted by the chemical and nuclear industries, which is one of the reasons. From the perspective of welding material, high-frequency welding can weld various types of austenitic stainless steel pipes. At the same time, the development of new steel grades and the advancement of forming welding methods has also successfully welded ferritic stainless steel AISI409 and other steel grades.

  Various welding methods of stainless steel welded pipe have their advantages and disadvantages. How to maximize the strengths and avoid weaknesses and combine several welding methods to form a new welding process to meet people’s requirements for the quality and production efficiency of stainless steel welded pipe is a new trend in the development of stainless steel welded pipe technology.

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