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Dissimilar Metal Joining of Steel to Aluminum by Lap Joint MIG Arc Brazing(Physics, Processes, Instruments & Measurements, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)

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Dissimilar metal joining of steel to aluminum, which is difficult due to the generation of the brittle intermetallic compound at the interface of the welded joint, by DC pulsed MIG arc brazing in a lap joint with the flux cored Al-Si filler wire has been investigated for the application of weight saving in automobiles. The major compounds generated at the interface between steel and weld metal were determined to be Al_<7.4>Fe_2Si as the Al-Fe-Si ternary compound. The transverse tensile strength of the welded joint was 79MPa, 70% of that of Al base metal, due to the fracture at the HAZ on the aluminum side.



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