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采用复合超高频脉冲方波变极性钨极氩弧焊技术(HPVP-GTAW,Hybrid ultrahigh frequency Pulse Variable Polarity Gas Tungsten Arc Welding)完成了2219-T87高强铝合金平板堆焊试验,研究了HPVP-GTAW工艺脉冲电流参数对焊缝成形参数的影响规律.结果表明,与常规变极性钨极氩弧焊(VP-GTAW)工艺相比,HPVP-GTAW工艺有利于增加焊缝熔深,提高焊缝深宽比;调节脉冲电流参数,将对焊缝成形行为产生显著影响.在正极性期间平均电流恒定的条件下,随着脉冲电流频率的增加,焊缝熔深、深宽比整体提高,60 kHz条件下深宽比增加了60%;适当增大脉冲峰值电流与基值电流的比值,焊缝深宽比有所增大;与占空比50%和80%条件相比,20%条件下焊缝深宽比最高,且随着峰值电流与基值电流比值的提高,其焊缝深宽比增幅最为明显.
Tensile tests of 2219-T87 high-strength aluminum alloy flat plate were completed with HPVP-GTAW (Hybrid ultrahigh frequency Pulse Variable Polarity Gas Tungsten Arc Welding). The effects of HPVP- GTAW process pulse current parameters on the weld forming parameters.The results show that, compared with the conventional variable polarity TIG welding (VP-GTAW) process, HPVP-GTAW process is conducive to increasing the weld penetration, improve the welding The aspect ratio and the aspect ratio of the weld seam can be significantly influenced by adjusting the pulse current parameters.With the average current constant during the positive polarity, the penetration depth and aspect ratio of the weld seam increase with the increase of the pulse current frequency, The aspect ratio increased by 60% at 60 kHz; the ratio of pulse peak current to base current increased appropriately, the aspect ratio of the weld increased; compared with 50% duty cycle and 80%, 20% Under the conditions of the highest aspect ratio of the weld, and with the peak current and the base current ratio increases, the most obvious increase in aspect ratio of the weld.