Dissimilar Metal Joining of A5052 Aluminum Alloy and AZ31 Magnesium Alloy Using Laser Brazing

Abstract:

The microstructure and mechanical properties of a joint produced by laser brazing between A5052 and AZ31 with AZ61, AZ91 and AZ125 filler metal was investigated. The effects of filler metals on joint characteristics are also discussed. Measurement of microstructural factors in the laser brazed joint revealed that increasing the laser power results in a decrease in the weld toe angle and an increase in the bead width, which indicates superior wettability. A high strength laser brazed joint can be achieved through the combination of good wettability and a thin intermetallic layer produced by a laser power of 590 W in a brazed joint with AZ125 filler metal Any further increase in power, however, results in a rapid increase in the thickness of the intermetallic compound (IMC) reaction layer. The superiority of the brazed joint with AZ125 filler metal is due to its lower melting point than that of AZ61 and AZ91 filler metal.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 2532-2536
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.2532
• Online since: November 2016
• Authors: Tomo Ogura*, Syunsuke Netsu, Tetsuya Yokochi, Kazuyoshi Saida
• Keywords: Aluminum Alloy, Dissimilar Metal Joining, Laser Brazing, Magnesium Alloy

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