| 摘要: |
| 采用普通TIG电弧作为焊接热源,对镁铝异种金属进行填加锌丝的对接焊试验.并利用金相显微镜、电子探针(EPMA)、万能力学性能拉伸机等现代分析手段对所得到的接头进行测试分析.结果表明,采用这种工艺得到了锌基的合金化焊缝,实现了6061铝合金和AZ31B镁合金的连接,焊缝主要由MgZn2和少量的铝、锌的固溶体构成,焊缝和铝合金母材之间不存在明显的过渡层,和镁合金母材之间有厚约20~100μm的过渡层.焊缝的硬度高于6061铝合金和AZ31B镁合金母材.对接接头的抗拉强度达到75 MPa. |
| 关键词: 镁铝异种金属 填锌丝对接焊 微观组织 力学性能 TIG |
| DOI： |
| 分类号: |
| 基金项目:中央高校基本科研业务费资助项目(DUT10ZD108);辽宁省博士启动基金资助项目(20091010) |
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| TIG butt welding between Mg alloy and Al alloy filling with Zn wire |
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LIU Fei, ZHANG Zhaodong, LIU Liming
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Key Laboratory of Liaoning Advanced Welding and Joining Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
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| Abstract: |
| Butt welding experiments of Mg to Al alloy filling with Zn wire were carried out by tungsten inert gas (TIG) welding. The welding joints were investigated and tested by metallography microscope, electronic probe micro-analyzer (EPMA), universal mechanical properties testing machine. The results indicated that the aluminum alloy 6061 and the magnesium alloy AZ31B was jointed with a good surface forming. The welded joints are mainly composed of MgZn2,the zinc base solid solution and the aluminum base solid solution, there are not the obvious transitional layer between welded seam and aluminum base metal and the transitional layers which approximately 20- 100μm between welded seam and magnesium base metal. The hardness of the weld seam is higher than that of the base metal aluminium alloy 6061 and magnesium alloy AZ31B. The tensile strength of the butt joint is 75 MPa. |
| Key words: distributable metal of Mg and Al butt welding filling with zinc wire microstructures mechanical properties TIG |
