摘要: |
本研究采用CO2激光-TIG电弧复合焊接方法对航天用2219铝合金开展了焊接工艺优化试验,研究了激光功率、焊接电流、焊接速度等参数对焊接接头成形的影响,得到了优化的CO2激光-TIG复合焊接参数,同时对优化焊接参数下焊接接头的显微组织和力学性能进行了分析。焊缝中心区域组织主要为Al-Al2Cu组成的共晶组织,形态上为细小的枝状晶,热影响区组织与母材组织近似,但是晶粒尺寸略大于母材。复合焊接接头平均抗拉强度为294 MPa,达到母材抗拉强度的70.84%,断后延伸率为8%,拉伸断裂特征为典型的韧性断裂。 |
关键词: 复合焊接;2219铝合金;工艺优化 |
基金项目: |
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Optimization of Laser-TIG Hybrid Welding Technology of 2219 Aluminum Alloy |
Zhang Zhenghao Liu Tianliang Liu Yunting Tang Yingying Long Yingying Guo Shengbin
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Capital Aerospace Machinery Co., Ltd., Beijing 100076
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Abstract: |
In this paper, CO2 laser and TIG arc hybrid welding method was used to carry out welding technology tests on 2219 aluminum alloy for aerospace use. The effects of laser power, current, welding speed and other parameters on the forming of welded joints were studied. The optimized hybrid welding parameters were obtained, and the microstructure and mechanical properties of welded joints were analyzed under the optimized welding parameters. The microstructure in the weld center area was mainly eutectic microstructure composed of Al-Al2Cu, with fine dendritic morphology. The microstructure in the heat affected zone was similar to that of the base material, but the grain size was slightly larger than that of the base material. The average tensile strength of the hybrid welded joint was 294 MPa, which was 70.84% of the base material, and the elongation after fracture was 8%. The tensile fracture was a typical ductile fracture. |
Key words: hybrid welding;2219 aluminum alloy;optimization of technology |