TC4脉冲PAW工艺研究

Study on Pulse PAW Technology of TC4

摘要:

进行了TC4直流PAW、高频脉冲PAW和“一脉一孔”型PAW焊接工艺研究,对比了三种PAW焊接工艺的焊缝外观形貌,力学性能和工艺性能,后两种焊接工艺焊接接头性能略优于直流PAW。高频PAW焊接工艺的高频脉冲对熔池的冲击作用,有利于增加电弧挺度、提升焊接速度；利用钛合金表面张力大特性配合合理的工艺参数,实现了稳定的TC4“一脉一孔”型焊接工艺,该工艺PAW比传统直流PAW焊缝外观成型更加美观,焊缝背面具有手工GTAW单面焊双面成型形貌特征,且更加均匀、美观,焊缝正面几乎没有下塌；力学性能试验和扫描电镜分析显示“一脉一孔”型PAW焊缝力学性能优于直流PAW,比传统“小孔型”PAW更适合TC4合金的焊接。

Abstract:

Comparison Study on DC PAW、high-frequency pulse PAW(HF-PAW) and one keyhole per pulse PAW procedure on TC4,the weld joint appearance of the high-frequency pulse PAW and one keyhole per pulse PAW are better than DC PAW,and the mechanical properties and processing properties of the three procedure measure up to the standard. As the High-frequency pulse,the high-frequency pulse PAW reinforce the arc force,bring down the probability of undercut,and raise the travel speed. The weld joint appearance of one keyhole per pulse PAW is smooth and uniform,the front of the weld joint is not subside at all,the mechanical properties test and the SEM test show that one keyhole per pulse PAW procedure is superior than traditional DC PAW,and this procedure is more suitable for TC4 PAW.