On the Joint strength and the structure of bonding interface in friction welding of aluminum alloy pipe to s25c carbon steel pipe

摘要

Friction welding of various aluminum alloy pipes toS25C carbon steel pipe were carried out to make clear weldabilityof dissimilar material pipes. Joints of A1050 A6061, and A 6063to S25C, and of A5052 and A5056 to S25C showed goodweldability and medium weldability respectively, and themaximum joint efficiencies of these joints in tensile test wereabout 85%, 83%, 91%, 68% and 44%. In these joints, aintermetallic compound of Al13Fe4 was formed at the weldinterface of these joints. On the other hand, the joints of A2011,A2017, A2024, and A7075 to S25C showed poor weldability, andthe maximum joint efficiencies of these joints were about 17%,27%, 17%and 39%. In these joints, CuAl2 and Al-Cu-Feintermatallic compounds were observed at the weld interfacebecause of these aluminum base alloy contained much copper.Therefore, it was supposed that the formation of intermetalliccompounds based on Cu deteriorated the weldability of A2000group and A 7075 to S25C.