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2219铝合金变极性TIG横焊接头组织与性能研究 |
孙世烜1,张勤练2,李延民1,周 庆1,李劲松1,熊林玉1,张 迪1,杨春利2,林三宝2
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1. 首都航天机械公司,北京 100076;2. 哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨 150001
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摘要: |
以8mm厚2219铝合金板为研究对象,开展变极性TIG电弧横焊技术初步研究。在优化焊接参数的基础上,得到不同焊接参数和成形良好的横焊接头,并对接头的组织和力学性能特征进行了分析。结果表明:当焊接速度较快时,接头气孔缺陷较少;多层多道焊接头受多次热循环影响,组织特征较为复杂;焊接参数变化对接头组织特征影响显著;稍大的焊接速度有利于提高接头的抗拉强度和弯曲性能;接头硬度虽然能够反映接头的力学性能,但接头强度还与接头内焊接缺陷的数量和分布密切相关。 |
关键词: 铝合金;横焊;微观组织;力学性能 |
基金项目: |
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Research on Microstructures and Mechanical Properties of Horizontal Position Welding Joints of 2219 Aluminum Alloy by Variable Polarity TIG |
Sun Shixuan1, Zhang Qinlian2, Li Yanmin1, Zhou Qing1, Li Jinsong1, Xiong Linyu1, Zhang Di1, Yang Chunli2, Lin Sanbao2
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1. Capital Aerospace Machinery Company, Beijing 100076;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001
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Abstract: |
The preliminary research on variable polarity TIG arc horizontal position welding technology based on 8mm thickness 2219 aluminum alloy has been carried out. Horizontal position welds with good formation were obtained after the optimization of welding parameters. The characteristics of microstructures and mechanical properties of the joints were analyzed. Results indicated that the porosity welding defects were not serious when the welding velocity was much higher. The characteristics of the microstructures were more complex due to the influence of the repeated thermal cycles. Moreover, the effect of welding current or welding velocity on microstructures was more apparent. The tensile strength and bending properties could be improved using higher welding velocity. The hardness distribution of the horizontal position welding joint could indicate its mechanical properties to a certain extent but the tensile strength of horizontal position weld had a close relationship with the amount and the distribution of welding defects. |
Key words: aluminum alloy;horizontal position welding;microstructures;mechanical properties |