Method for joining metallic members, joint structure and brazing filler metal

Abstract

In joining an Fe-based metallic member comprising an Fe-based material and an Al-based metallic member comprising an Al-based material by a Zn-based brazing filler metal, a joined part of the Fe-based metallic member is heated at a temperature higher than a melting point of the Fe-based material.

1 . A method for joining metallic members comprising:
 joining plural metallic members by a brazing filler metal using laser beam as a heat source;   using an Fe-based metallic member containing an Fe-based material and an Al-based metallic member containing an Al-based material as the metallic members;   using a Zn-based brazing filler metal as the brazing filler metal;   evaporating the brazing filler metal by irradiation with the layer beam;   forming a key hole by melting a joined part of the metal members; and   multiply reflecting the laser beam in the key hole.   
     
     
         2 . A method for joining metallic members comprising:
 joining plural metallic members by a brazing filler metal using laser beam as a heat source;   using an Fe-based metallic member containing an Fe-based material and an Al-based metallic member containing an Al-based material as the metallic members;   forming a groove shape by the Fe-based metallic member and the Al-based metallic member,   evaporating the brazing filler metal by irradiation with the layer beam; and   multiply reflecting the laser beam in the key hole.