摘要
分别采用常规VPTIG和超快变换复合超音频脉冲VPTIG焊接工艺对2219-T87高强铝合金进行焊接,通过X射线探伤、金相分析、接头力学性能测试等方法对焊接质量进行对比分析。结果表明,复合超音频脉冲VPTIG焊接工艺可有效减少甚至消除高强铝合金焊缝气孔缺陷,细化焊缝组织,显著改善和提高焊接接头性能。与常规VPTIG焊接工艺相比,在脉冲电流频率40kHz、占空比20%、脉冲电流幅值100A条件下,2219-T87焊接接头抗拉强度和断后伸长率分别提高约32%和138%。
Microstructure and mechanical properties of 2219-T87 high-strength aluminum alloy weld joints are investigated based on the conventional VP- TIG and ultrafast-convert hybrid ultrasonic pulse VPTIG （HPVP-TIG） welding technology. The results show that the number of gas pore in welds obtained by the HPVPTIG welding process is predominantly reduced and eliminated indeed. The grain structure is refined and the mechanical properties of weld joint are significantly enhanced. Under the conditions of pulse frequency of 40 kHz, pulse duty of 20% and pulse current amplitude of 100 A, tensile strength and percentage elongation increase about 32% and 138%, respectively by compare it with the conventional VPTIG process.
出处
《航空制造技术》
2010年第20期91-93,97,共4页
Aeronautical Manufacturing Technology
关键词
高强铝合金
超音频脉冲电流
变极性
焊缝气孔
力学性能
High-strength aluminum alloy Ultrasonic pulse current Variable polarity Weld porosity Mechanical property
