| 摘要 |
PURPOSE:To provide a brazing method for an iron material having excellent joint strength and an aluminum material. CONSTITUTION:A brazing filler metal 3 having the intermediate m.p. of the iron material 1 and the aluminum material 2 is arranged at a boundary for joining and the iron material 1 and the brazing filler metal 3 are heated more than the m.p. of the brazing filler metal by the high frequency coil 3 as well as these materials are brazed by maintaining the parts exclusive of the part near the joining boundary of the aluminum material at a temp. below the m.p. of the aluminum material. Generation of heat takes place concentrically at the iron material 1 and the brazing filler metal 3 and the heat generation of the aluminum material 2 is hardly generated. The part near the boundary of the brazing filler metal and the aluminum material is heated and the oxidized film of the aluminum surface is removed, by which the brazing filler metal 3 and the aluminum material are brought into a wetting state when the solderfiller 3 is molten. The brazing filler metal 3 cools and solidifies and a defectless joint is obtd. if heating is stopped at this time. While the brazing filler metal to be used is brazing filler metals, exclusive of Al-Si materials, having the m.p. higher than the m.p. of the aluminum material and, therefore, there is no generation of brittle intermetallic compds., such as Fe2Al5, in the brazed parts and the joint part having the excellent strength is obtd. |
