Feasibility of cold-metal-transfer welding magnesium AZ31 to galvanized mild steel

	Feasibility of cold-metal-transfer welding magnesium AZ31 to galvanized mild steel
	Cao, R.1; Yu, J. Y.1; Chen, J. H.1; Wang, Pei-Chung 2
刊名	Welding Journal
	2013-09-01
卷号	92 期号:9 页码:274s-282s
关键词	Aluminum alloys Automobile manufacture Brazing Carbon steel Dissimilar materials Fuel economy Galvanized metal Hematite Intermetallics Joining Magnesium alloys Metals Solid solutions Welded steel structures Welding Welds Zinc alloys Zinc coatings Automotive manufacturers Chemical and physical properties Cold metal transfers Element distribution Magnesium AZ31 Number of vehicles Technical challenges Vehicle structures
ISSN号	00432296
英文摘要	Automotive manufacturers are faced with increasing pressure to reduce vehicle weight, improve fuel economy, reduce emissions, and enhance vehicle safety and performance. Therefore, an increasing number of vehicle structures are built using combinations of dissimilar materials such as steel, aluminum, and magnesium. Though the advantages are potentially huge, this hybrid fabrication approach raises substantial technical challenges to the design of vehicle structures and the associated joining processes. Differences in chemical and physical properties and the fact that neither solid solutions nor intermetallics exist between Mg and steel make the joining of Mg alloys to steels through conventional fusion welding impossible. In this study, fusion welding of 1-mm-thick Mg AZ31 to 1-mm-thick galvanized mild steel lap joints was investigated. A cold metal transfer (CMT) fusion joining technique was adopted. Extensive welding tests with Mg wire were conducted and microstructures and element distributions were characterized. Based on the experimental results, it was found that CMT welding of Mg to steel is possible if the steel has a zinc coating because the zinc, which has a lower melting temperature than the steel, interacts with the molten Mg alloy to provide a braze joint. The brazing interface between the Mg weld metal and galvanized mild steel primarily consists of Al, Zn, and Mg intermetallics and solid solution, such as Mg solid solutions, MgFeAlO4, Fe2O3, and Mg2Zn 11 The strength of the CMT weld-brazed, lap-shear, 1-mm-thick Mg AZ31-galvanized mild steel joint is comparable to the strength of a lap-shear 1-mm-thick Mg AZ31-Mg AZ31 welded joint.
资助项目	National Nature Science Foundation of China[51265028]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	American Welding Society
WOS记录号	WOS:000326131000021
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113492]
专题	材料科学与工程学院
通讯作者	Cao, R.
作者单位	1.Lanzhou Univ Technol, Lanzhou, Gansu, Peoples R China 2.Gen Motors Mfg Syst Res Lab, Warren, MI USA
推荐引用方式 GB/T 7714	Cao, R.,Yu, J. Y.,Chen, J. H.,et al. Feasibility of cold-metal-transfer welding magnesium AZ31 to galvanized mild steel[J]. Welding Journal,2013,92(9):274s-282s.
APA	Cao, R.,Yu, J. Y.,Chen, J. H.,&Wang, Pei-Chung.(2013).Feasibility of cold-metal-transfer welding magnesium AZ31 to galvanized mild steel.Welding Journal,92(9),274s-282s.
MLA	Cao, R.,et al."Feasibility of cold-metal-transfer welding magnesium AZ31 to galvanized mild steel".Welding Journal 92.9(2013):274s-282s.