2219铝合金变极性TIG横焊接头组织与性能研究

2219铝合金变极性TIG横焊接头组织与性能研究

孙世烜;张勤练;李延民;周庆;李劲松;熊林玉;张迪;杨春利;林三宝

【期刊名称】《航天制造技术》 【年(卷),期】2015(000)001

【摘要】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.%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。