Abstract
This review aimed to provide a comprehensive overview of the recent progress in fusion welding of steel and heterogeneous metals and to introduce current research and application. Amongst numerous metals, TiNi shape memory alloys and steel have been most heavily investigated for producing excellent joints. However, the base materials on both sides of the traditional fusion welding must melt and the large melting point difference between the two seriously affects the weld formation. The metal compounds formed by the base materials on both sides also hinder the improvement of the mechanical properties of the joint. This review focused on the fundamental understanding of the microstructural characteristics, processing and property relationships in the welding and joining of heterogeneous joints. The primary problem finding intermediate metals with enhanced plasticity and toughness to improve the formation of joints. Welding of light metals and high specific strength metals has a wide range of applications in the aerospace industry, it is committed to reducing the quality of flight equipment.
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