Microstructure and Properties of an Al 6061/Galvanized Plate Fabricated by CMT Welding
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https: //doi. org/10.1007/s11595-020-2340-3
Microstructure and Properties of an Al 6061/Galvanized Plate Fabricated by CMT Welding ZHANG Qi1,2, ZHANG Peilei1,2,3*, YU Zhishui1,2*, YAN Hua1,2, SHI Haichuan1,2, WU Di1,2, LI Shaowei1,2, TIAN Yingtao4
(1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; 2. Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China; 3. Fraunhofer Institute for Laser Technology ILT, Aachen 52074, Germany; 4. Department of Engineering, Lancaster University, Lancaster, UK)
Abstract: Aluminum alloy 6061 was welded with zinc coated low carbon steel by cold metal transfer (CMT). The microstructure composition, morphology and growth process of the welding joint and the HAZ were researched. The weld area on the side of the galvanized steel sheet mainly contains Fe2Al5. And on the side of the aluminum alloy substrate, it is mainly filled with a needle-like FeAl3. At the same time, Al8Fe2Si is formed at the edge of FeAl3. The zinc-rich region on the side of the aluminum alloy mainly contains an aluminum-zinc solid solution and an aluminum-zinc co-crystal, and the current size had no significant effect on the type and morphology of the compounds produced in the interface layer. Key words: cold metal transfer; microstructure; microhardness; dissimilar metals
1 Introduction In recent years, the direction of the developing lightweight vehicles, environmental protection, energy saving and safety has become the goal pursued by the automotive industry[1]. A large number of aluminum alloy used in the car manufacturing process, reduced the total mass of car, while reducing fuel consumption in the car driving process. And aluminum parts recycling can also promote material savings. However, due to safety considerations, the all-aluminum body has not been promoted[2-6]. Therefore, the increasing use of different materials “steel + aluminum” in the automotive field has become the development direction of the automobile body. In many industrial sectors, sheet steel is the more basic material, and galvanized © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 29, 2019; Accepted: May 18, 2020) ZHANG Qi (张琪): E-mail: [email protected] *Corresponding author: ZHANG Peilei (张培磊): Assoc. Prof.; Ph D; E-mail: [email protected]; YU Zhishui (于治水): Prof.; Ph D; E-mail: [email protected] Funded by National Natural Science Foundation of China (No. 51905333), Shanghai Sailing Program (No. 19YF1418100), Shanghai Science and Technology Committee Innovation Grant (Nos. 17JC1400600, 17JC1400601, 19511106400 and 19511106402), Shanghai Local Colleges and Universities Capacity Building Special Plan Project (No. 19030501300)
steel is widely used in the automotive industry due to its excellent corrosion resistance. Therefore, it becomes particularly crucial to achieve an effective and reliable connection of the aluminum alloy and the galvanized steel sheet. Duri
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