The modification of welding current waveform according to practical conditions and requirements, is an important way to improve the welding quality of various metals, especially the application of high-frequency pulsed current in arc welding. In this paper, the research activities and progress to date in the application of high-frequency (usually more than 5 kHz) pulsed current in arc welding are reviewed in detail, mainly including four significant categories of output current waveforms and their performance characteristics and weld quality: high-frequency pulsed current waveform, high-frequency pulsed variable polarity current waveform, double-pulsed current waveform and inter-pulse GTAW welding adopting SiC-based power devices. In conclusion, in the fusion welding process, the introduction of high-frequency pulsed current is beneficial to the constriction of welding arc, the increase of weld penetration depth, the reduction of weld porosity, the refinement of the microstructure in weld zone and the enhancement of weld mechanical properties. And in the future, the advanced SiC-based power devices is going to replace the present Si-based power devices and bring about a profound change to the welding processes.

根据实际条件和要求修改焊接电流波形，是提高各种金属焊接质量的重要途径，特别是高频脉冲电流在电弧焊中的应用。本文详细综述了高频（通常大于5 kHz）脉冲电流在电弧焊中的研究活动和最新进展，主要包括输出电流波形的四个重要类别及其性能特征和焊接质量：采用基于SiC的功率器件的高频脉冲电流波形，高频脉冲可变极性电流波形，双脉冲电流波形和脉冲间GTAW焊接。总之，在熔焊过程中，引入高频脉冲电流有利于焊接电弧的收缩，焊缝熔深的增加，焊缝孔隙率的降低，焊缝区组织的细化以及焊缝力学性能的增强。将来，先进的SiC基功率器件将取代现有的Si基功率器件，并给焊接工艺带来深刻的变化。