Abstract
Advanced high strength steel (AHSS) is being increasingly used in automotive industries for weight reduction purposes. Hot stamping steel, which is a boron alloyed steel, has a strength greater than 1500MPa after hot forming and successive quenching. Because the heating temperature is normally greater than 900°C, a thin Al-Si based coating layer is applied to the steel surface to prevent oxidation. In this study, metallurgical characteristics of laser weldments were investigated in hot stamping steel plates with and without an Al-Si coating layer. The behavior of the Al-Si coating layer after the hot stamping process was analyzed, and the effects of Al-Si coating on laser weldability were investigated. Keyword: Al-Si coated steel; Boron-alloyed steel; Laser welding.
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