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Laser-tungsten inert gas hybrid welding of dissimilar metals AZ31B Mg alloys to Zn coated steel
Highlights ► Successful joining Mg to Zn coated steel using laser-TIG hybrid welding. ► Metallurgical bonding was achieved at the Mg/Zn coated steel interface. ► Influence of laser power on joining Mg to Zn coated steel was investigated. ► Newly formed Fe3Al phase improved the interfacial bonding and joint strength. ► The role of Zn coating in joining Mg to steel was clarified.
Abstract Laser-tungsten inert gas (TIG) hybrid welding has been developed for joining Mg alloys to Zn coated steel in a lap joint configuration. The joint could not be produced in laser or arc welding only, while acceptable joints without obvious defects were obtained with a relatively wide processing window in the hybrid process. Two reaction layers were observed to form at the interface and were identified as Mg–Zn eutectic structure (α-Mg+MgZn) and Fe3Al phase by TEM analysis. In some cases, Al6Mn phase also formed adjacent to the Fe–Al reaction layer. The tensile-shear strength attained the maximum value of 68MPa, representing 52.3% joint efficiency relative to Mg base metal. The element Al from AZ31B Mg alloys diffused to the liquid/solid interface and then reacted with the elements from steel, such as Fe and Mn, contributing to the metallurgical bonding at the interface. The weak bonding between Mg–Zn reaction layer and newly formed Fe–Al layer resulted in the interfacial failure.
Laser-tungsten inert gas hybrid welding of dissimilar metals AZ31B Mg alloys to Zn coated steel
Highlights ► Successful joining Mg to Zn coated steel using laser-TIG hybrid welding. ► Metallurgical bonding was achieved at the Mg/Zn coated steel interface. ► Influence of laser power on joining Mg to Zn coated steel was investigated. ► Newly formed Fe3Al phase improved the interfacial bonding and joint strength. ► The role of Zn coating in joining Mg to steel was clarified.
Abstract Laser-tungsten inert gas (TIG) hybrid welding has been developed for joining Mg alloys to Zn coated steel in a lap joint configuration. The joint could not be produced in laser or arc welding only, while acceptable joints without obvious defects were obtained with a relatively wide processing window in the hybrid process. Two reaction layers were observed to form at the interface and were identified as Mg–Zn eutectic structure (α-Mg+MgZn) and Fe3Al phase by TEM analysis. In some cases, Al6Mn phase also formed adjacent to the Fe–Al reaction layer. The tensile-shear strength attained the maximum value of 68MPa, representing 52.3% joint efficiency relative to Mg base metal. The element Al from AZ31B Mg alloys diffused to the liquid/solid interface and then reacted with the elements from steel, such as Fe and Mn, contributing to the metallurgical bonding at the interface. The weak bonding between Mg–Zn reaction layer and newly formed Fe–Al layer resulted in the interfacial failure.
Laser-tungsten inert gas hybrid welding of dissimilar metals AZ31B Mg alloys to Zn coated steel
Tan, Caiwang (author) / Li, Liqun (author) / Chen, Yanbin (author) / Guo, Wei (author)
2013-02-16
8 pages
Article (Journal)
Electronic Resource
English
Laser-tungsten inert gas hybrid welding of dissimilar metals AZ31B Mg alloys to Zn coated steel
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