| 焊丝成分对5E61铝合金TIG焊接头组织和性能的影响 |
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| 引用本文： | 毛晓东,谷宁杰,宋小雨,任思蒙,路丽英,李虎田. 焊丝成分对5E61铝合金TIG焊接头组织和性能的影响[J]. 焊接学报, 2022, 43(4): 86-93. DOI: 10.12073/j.hjxb.20211024001 |
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| 作者姓名： | 毛晓东 谷宁杰 宋小雨 任思蒙 路丽英 李虎田 |
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| 作者单位： | 1.中铝材料应用研究院有限公司, 北京, 102209 |
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| 基金项目： | 国家重点研发计划项目(2021YFB3704200); |
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| 摘 要： | 为研究焊丝成分对5E61铝合金船板焊接接头组织和性能影响,试验采用Wire-1561,Wire-5B71和Wire-5E613种焊丝对4 mm厚5E61-H116铝合金船板进行非熔化极惰性气体保护焊(tungsten inert gas welding,TIG焊),并分析了焊接接头的表面形貌、成形质量、微观组织和力学性能. 结果表明,在相同的焊接工艺下,3种焊丝接头焊缝成形质量良好,焊缝中心无肉眼可见气孔. 不同焊丝接头焊缝区显微组织差异明显,Wire-5B71焊缝晶粒最小,Wire-5E61焊缝晶粒次之,Wire-1561焊缝晶粒最大. 由于Mg元素的固溶强化和Er元素的细晶强化,Wire-5E61接头焊缝区显微硬度最大. 对接头试样进行拉伸测试,接头断裂位置主要沿熔合线附近的柱状晶区,此位置显微硬度最低. Wire-1561,Wire-5B71和Wire-5E61 3种焊丝接头抗拉强度分别为322,323和338 MPa,焊接系数分别为0.83,0.84和0.88,断后伸长率分别为13.0%,14.5%和14.5%,满足实际工程应用.
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| 关 键 词： | 5E61铝合金 TIG焊 微观组织 力学性能 |
| 收稿时间： | 2021-10-24 |
Effect of welding wire composition on microstructure and properties of 5E61 aluminum alloy TIG welded joints |
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| Affiliation: | 1.Chinalco Material Application Research Institute Co., Ltd., Beijing, 102209, China2.Northeast Light Alloy Co., Ltd., Harbin, 150060, China |
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| Abstract: | To study the effect of welding wire composition on the microstructure and properties of 5E61 aluminum alloy ship plates welding joints, the tungsten intert-gas (TIG) welding of 4 mm 5E61-H116 aluminum alloy ship plate was conducted using Wire-1561, Wire-5B71 and Wire-5E61 welding wires. The welded joints' surface morphology, forming quality, microstructure, and mechanical properties were analyzed. The results showed that the welding quality of the three kinds of welding joints performed well under the same welding process, and there were no visible porosities in the welding center zone. The microstructure of the welding zones was different. The grain size of the welding zone by Wire-5B71 was the smallest, followed by Wire-5E61, and the one of Wire-1561 was the largest. Due to the solution strength of the Mg element and the refined crystalline strength of Er element, the microhardness of the welding joint by Wire-5E61 performed the highest. The extension tests of welding joints have proceeded. The results showed the fracture locations of the joints were mainly located along the columnar crystal region near the fusion lines, where the microhardness displayed the lowest. The tensile strength of weld joints prepared by Wire-1561, Wire-5B71 and Wire-5E61 were 322, 323 and 338 MPa, respectively. The welding coefficients were 0.83, 0.84 and 0.88, respectively, and the elongations after fracture were 13.0%, 14.5% and 14.5%, respectively, which can meet practical engineering applications. |
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