2A14-T6铝合金复合超高频脉冲方波变极性GTAW焊缝成形特征  

Weld formation characteristics in hybrid pulse variable polarity GTAW of 2A14-T6 aluminum alloy

作　　者：李伟[1,2] 从保强[1] 齐铂金[1] 王乐笑[1] 杨明轩[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191 [2]北京石油化工学院电气工程系,北京102617

出　　处：《焊接学报》2012年第10期59-62,66,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51005011);中国博士后科学基金资助项目(20090460186)

摘　　要：以2A14-T6高强铝合金为对象,借助焊缝成形参数来评价复合超高频脉冲方波变极性钨极氩弧焊(HPVP-GTAW)焊缝成形的特征,研究了HPVP-GTAW过程中超高频脉冲方波电流参数对焊缝成形的影响.结果表明,与常规VP-GTAW电弧焊相比,在焊接过程中加入超高频脉冲方波电流可以提高焊缝熔透率,改善焊缝成形;在脉冲电流幅值和占空比一定时,脉冲电流频率对HPVP-GTAW焊缝成形影响显著;正极性持续期间有效电流保持基本一致(变化范围±5 A)条件下,在一定范围内提高脉冲电流频率,增加脉冲电流幅值,同时减小占空比,可明显提高铝合金HPVP-GTAW焊缝的熔透率.For HPVP-GTAW welding,the weld forming characteristics of 2A14-T6 aluminum alloy was evaluated,and the effect of ultrahigh frequency pulse square-wave current parameters on weld formation was investigated as well.The experimental results indicated that,compared with traditional variable polarity GTAW,the application of ultrahigh frequency pulse square-wave current can improve the weld penetration and the weld formation.When the amplitude and the ratio of pulse current are fixed,pulse frequency can significant affect the weld formation.Keeping the RMS of positive current unchanged approximately with permissible variation of ±5A,increasing the pulse current frequency and amplitude as well as decreasing the pulse current duty cycle within a certain range have an evident effect on enhancing the weld penetration of aluminum alloy in HPVP-GTAW process.

关 键 词：高强铝合金 超高频脉冲电流 变极性钨极氩弧焊 焊缝成形 

分 类 号：TG457.14[金属学及工艺—焊接]