复合添加Ti和Sr对AA4043铝合金焊丝变质和AA6082 TIG焊接接头力学性能的影响_论文

发布于:2021-06-19 13:59:53

Trans. Nonferrous Met. Soc. China 27(2017) 272?281 Effect of combinative addition of Ti and Sr on modification of AA4043 welding wire and mechanical properties of AA6082 welded by TIG welding Bo WANG1, Song-bai XUE1, Chao-li MA1, Yi-long HAN1, Zhong-qiang LIN2 1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2. Zhejiang Yuguang Aluminum Material Co., Ltd., Jinhua 321200, China Received 8 January 2016; accepted 31 August 2016 Abstract: To improve the mechanical properties of AA6082 weld welded by tungsten inert gas welding using AA4043 welding wire, the effect of addition of Ti and/or Sr on continuous cast and rolled AA4043 welding wire was investigated. Experimental results indicated that Ti and Sr are excellent modifiers, which improve the microstructure of the AA4043 welding wire and enhance the mechanical properties of the AA6082 weld. It was found that the combinative addition of Ti and Sr can effectively modify both the α(Al) dendrites and eutectic Si phases compared with individual addition of Ti or Sr. In addition, Ti and/or Sr also changed the microstructure of the AA6082 weld. The tensile strength of the AA6082 weld reached the maximum value when 0.08% Ti and 0.025% Sr were added simultaneously. These results indicate that the combinative addition of Ti and Sr can be an effective composite modifier. Key words: AA4043 welding wire; titanium; strontium; modification; gas tungsten arc welding; microstructure; mechanical properties 1 Introduction 6000 series aluminum alloys are used extensively for rocket shell, cryogenic tanks, engine castings and other medium strength structures [1]. Therefore, welding of these alloys by different welding methods [2?6] including tungsten inert gas (TIG) welding is considered one of the most important issues in these industries. AHMAD and BAKAR [7] and VERMA et al [8] suggested that AA4043 welding wire is more appropriate for welding of 6000 aluminum alloys, for the alloys of the 6000 series alloys are more sensitive to hot cracking than the alloys of the 5000 series, while AA4043 welding wire is a silicon-based alloy that is often used to take advantage of the elements capability of promoting fluidity in aluminum and is less sensitive to weld cracking. However, it is difficult to obtain a good 6000 series alloy welded joint with good comprehensive mechanical properties using unmodified AA4043 welding wires, because of the large acicular eute

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