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基于一种新型超快变换复合脉冲变极性电路变换拓扑,在正极性电流持续期间,叠加超音频直流脉冲方波电流,获得了过零无死区时间且具有快速电流上升沿和下降沿变化速率的复合超音频脉冲变极性方波电流,将其应用于铝合金的变极性TIG焊接过程,试验研究复合超音频脉冲方波变极性TIG电弧电学特性及其对铝合金焊缝成形等行为的变化规律.研究结果表明:超音频脉冲方波电流对变极性TIG电弧具有显著的收缩效应,电弧径向尺寸明显减小,在一定范围内提高脉冲电流频率,减小脉冲占空比,增加脉冲电流幅值,可提高铝合金焊缝熔透率,有利于改善和提高铝合金的焊接质量.
Based on a novel ultrafast transform compound pulse polarity changer topology, the square wave current of super-audio DC pulse is superimposed during the positive current, resulting in zero-crossing without dead-time and with fast current rising and falling edges Rate of composite super-audio pulse variable polarity square wave current, which will be applied to the aluminum alloy TIG welding process, the experimental study of composite ultrasonic pulse square wave TIG arc electrical characteristics and its deformation of aluminum alloy welding Etc. The results show that the square wave current of super-audio frequency pulse has a significant shrinkage effect on the TIG arc of variable polarity and the arc radial size is obviously reduced, and the pulse current frequency is increased within a certain range and the pulse duty is reduced Compared to increase the pulse current amplitude, can improve the weld penetration rate of aluminum alloy is conducive to improving and improving the quality of aluminum welding.