Suppression of intermetallic reaction layer formation by controlling heat flow in dissimilar joining of steel and aluminum alloy

By R. Borrisutthekul, Taisei Yachi, Y. Miyashita, Y. Mutoh. 2007

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Fibre laser welding of dissimilar alloys of Ti-6Al-4V and Inconel 718 for aerospace applications (2011, background): “Regarding the issue of different conductivities between welding materials, applying a backing block below welding samples has been pointed out as a method to control the heat flow and effectively suppress the thickness of the intermetallic layer in welding of steel to aluminium alloy [13].”
Review of research progress on aluminium–magnesium dissimilar friction stir welding (2018, background): “The joint strength in heterogeneous structures such as Al–Mg dissimilar welds primarily depends on two mechanisms, namely; the chemical bonding by the presence of IMCs, and; the mechanical interlocking due to the tortuous weld interface [16,17].”
Welding of Aluminum Alloys to Steels: An Overview (2014, background): “The copper backing blocks are very familiar in the welding industry and their use was studied to control the heat flow with the successful report on the reduction of the intermetallic layers during the laser welding of a high strength steel (Dual-TEN 590 steel) and A6022-O aluminum alloy [50].”