Techniques for Successfully Welding Alloy Pipe

摘要

Pipe made from highly alloyed metals requires a higher level of gas tungsten arc welding (GTAW) proficiency to meet the standards required in the power-generation, nuclear, petrochemical, food, pharmaceutical, and processing industries. While alloying elements such as nickel, chromium, molybdenum, copper, and cobalt add greater mechanical properties to carbon steel pipe, they also make the pipe more difficult to weld. This article focuses on the techniques required from the welder's perspective, so that he or she can make the transition from GTA welding carbon steel to GTA welding alloy metals such as stainless steel, duplex stainless steel, Inconel® (Ni-Cr, Ni-Cr-Mo, and Ni-Cr-Co-Mo alloys), Monel® (Ni-Cu and Cu-Ni alloys, and pipe from related alloys. While each alloy has its own specific considerations, similarities do exist.