Zinc and Al-Si coating effects in welding of advanced high strength steel

滑铁卢大学、汽车钢产品生产商ArcelorMittal Dofasco和致力于保护锌及其用户利益的组织Zelixir Inc.提出的合作研发项目旨在调查锌和铝硅涂层对先进高强度钢(AHSS)焊接性的影响。电阻点焊和激光焊接过程中的涂层行为及其对焊缝组织的影响与接头在静、动态载荷条件下的力学性能密切相关。重点研究了AHSS焊接过程中锌涂层引起的液态金属脆化和Al-Si涂层引起的熔合区软化问题。该研究将为锌涂层LME裂纹的缓解和修复以及Al-Si涂层AHSS焊接熔合区软化提供指导。此外，该项目还将增加对焊接过程中涂层和基材反应的了解。这项研究的结果总体上将有利于加拿大的制造业，并将特别对钢铁和汽车行业做出重大贡献。培训高素质人才将有助于培养制造业人才，同时加强滑铁卢大学作为世界知名研究机构的声誉。**

The proposed collaborative research and development project between the University of Waterloo, ArcelorMittal Dofasco, a producer of automotive steel products, and Zelixir Inc., an organization dedicated to the interest of zinc and its users, aims to investigate the effects of Zn and Al-Si coatings on the weldability of advanced high strength steel (AHSS). The coatings behavior and its effects on weld microstructure during resistance spot welding (RSW) and laser welding will be correlated with the mechanical performance of the joints under static and dynamic loading conditions. The focus will be towards liquid metal embrittlement (LME) due to Zn coating and fusion zone softening due to Al-Si coating during welding of AHSS. The investigation will provide a guideline for mitigation and remediation of LME cracks in Zn coated and fusion zone softening in Al-Si coated AHSS during welding. Moreover, the project will increase knowledge of coating and substrate reaction during welding. The results of the study will be beneficial to the Canadian manufacturing sectors in general, and will specifically contribute significantly to the steel and automotive industries. Training of highly qualified personnel (HQP) will assist in fostering talent in the manufacturing industry and simultaneously strengthen the reputation of the University Waterloo as a world-renown research institution.**