Abstract
Specially engineered microstructures are responsible for the functional properties of advanced high-strength steels (AHSSs). The morphology, volume fraction and distribution of various phases in these steels are obtained by judicious alloy design and controlled mill processing. The temporal conditions during welding cause significant changes in the microstructure, which in turn affect the mechanical properties. Zinc vaporises during welding of coated high-strength steels and becomes susceptible to localised corrosion. Metal inert gas (MIG) brazing is a suitable process to join galvanized steels by using copper-based consumables with low melting points. Friction stir spot welding is a promising alternative process for welding AHSS, with superior joint performance.
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