Dissimilar material joining using laser (aluminum to steel using zinc-based filler wire) |
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Authors: | Alexandre Mathieu Rajashekar Shabadi Alexis Deschamps Michel Suery Simone Matteï Dominique Grevey Eugen Cicala |
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Institution: | aLTm, laboratoire Laser et Traitement des matériaux, IUT Le Creusot, 12 rue de la fonderie, 71200 Le Creusot, France;bLTPCM, Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques, ENSEEG, 38402 St. Martin d’Hères, France;cGPM2, laboratoire Génie Physique et Mécanique des Matériaux, ENSPG, 38402 St. Martin d’Hères, France |
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Abstract: | Joining steel with aluminum involving the fusion of one or both materials is possible by laser beam welding technique. This paper describes a method, called laser braze welding, which is a suitable process to realize this structure. The main problem with thermal joining of steel/aluminum assembly with processes such as TIG or MIG is the formation of fragile intermetallic phases, which are detrimental to the mechanical performances of such joints. Braze welding permits a localized fusion of the materials resulting in a limitation on the growth of fragile phases. This article presents the results of a statistical approach for an overlap assembly configuration using a filler wire composed of 85% Zn and 15% Al. Tensile tests carried on these assemblies demonstrate a good performance of the joints. The fracture mechanisms of the joints are analyzed by a detailed characterization of the seams. |
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Keywords: | Laser beam joining Aluminum Steel |
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