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Joining mechanism of Mg alloy/steel butt joints with Cu�CZn interlayer by hybrid laser�CTIG welding source |
Gang Song 1 �� Hong-yang Wang 1 �� Tao-tao Li1 �� Li-ming Liu1 |
Key Laboratory of Liaoning Advanced Welding and Joining Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China |
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Abstract Hybrid laser�CTIG (tungsten inert gas) welding technology was used to join the Mg to steel with Cu�CZn interlayer. The eff ect of Al content in Mg alloy on the interface bonding of AZ31BMg/Q235 steel dissimilar butt joints was investigated. For comparison, ZK60 Mg alloy with no Al addition and AZ31 Mg alloy were utilized. The results showed that AZ31/Q235 butt joints with Cu�CZn interlayer, of which the fractures occurred in the Mg weld seam, showed quite sound and reliable interface bonding. The obvious concentration of element Al occurred along the Mg/steel interface. The results indicated that the addition of Cu�CZn interlayer, especially Zn, could significantly decrease the reaction temperature of Fe�CAl at the Mg/ steel interface and promote the formation of reaction layer along the interface. The diffusion of Al element on the Mg�CFe interface was increased by the Cu�CZn interlayer. For ZK60 Mg alloy, Mg and Zn approaching the Mg�CFe interface were evaporated. The intense vaporizing could inhibit the direct contact between steel and Mg weld pool, even destroying the possible formation of reaction layer. The intimate interface bonding of AZ31/Q235 butt joints was attributed to the synergistic effect of element Al and Cu.
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Received: 17 January 2017
Published: 16 May 2018
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