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Al-Si coated press-hardened steel (PHS) welding was carried out using fiber laser with Ar and air atmospheres under different atmospheres. The formation mechanism of δ-ferrite in welded seam (WS) was: the melting Al-Si coating diffused into molten pool such that the stabilization of high-temperature δ-ferrite was improved as well as the phase transformation (δ→γ) was restrained by the effect of laser...
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