BRAZING METHOD FOR DIFFERENT METALLIC MEMBERS

摘要

PURPOSE:To improve the reliability of a brazed part in the stage of brazing a Cu member and Ti member by preheating the Cu member to distribute uniformly the temp. in the brazing part then brazing both members by using a brazing filler metal consisting of Ag or Cu-Ag alloy. CONSTITUTION:Electricity is conducted to a heating element 15 installed to a brazing device 10 to preheat a Cu pipe 13. Gaseous Ar is then forcibly fed from a torch 18 and pipelines 20, 21 to shield a joint part 22. An arc is generated from the torch 18 and the brazing filler metal 19 is supplied; at the same time a Ti pipe 14 and a Cu pipe 13 are rotated and are brazed along the circumferential direction. The brazing part 23 is kept preheated to an optimum temp. by the arc heat and the element 15. Since the temp. is uniformly distributed in the joint part in the above-mentioned manner, the brazing filler metal is easily wetted. Not only the good workability but also the brazed part having high reliability are thus obtd.