高频脉冲复合直流微TIG焊接电源及其电弧形态特征  

Power supply for DC superposed high-frequency pulse micro-TIG and its arc characteristics

作　　者：王奕楷 庞世炫 王燮阳 黄增好 曹彪[1] Wang Yikai;Pang Shixuan;Wang Xieyang;Huang Zenghao;Cao Biao(South China University of Technology,Guangzhou 510640,China;Guangzhou Jingyuan Electronic Equipment Co.,Ltd.,Guangzhou 510735,China)

机构地区：[1]华南理工大学,广州510640 [2]广州市精源电子设备有限公司,广州510735

出　　处：《焊接》2023年第3期54-59,共6页Welding & Joining

摘　　要：针对微TIG小电流电弧不稳定的问题,研发了一种高频脉冲复合直流的微TIG焊接电源。通过测试输出电流波形,结合高速摄影采集电弧形貌,研究小电流电弧形态特征及高频脉冲复合直流对极限小电流电弧、6 mm间隙微电弧的影响,探讨微TIG电弧形态形成的原因及高频脉冲作用效果。结果表明,该电源输出的高频脉冲电流可实现快速变换,且具有精度高、输出稳定的特点;随着电流减小,电弧形态发生变化,并非保持“钟罩状”,高频脉冲电流可提高微TIG电弧稳定性,使电弧在平均电流低至2 A时也能维持稳定燃烧;6 mm间隙时,8 A微TIG电弧在燃烧过程中会发生大幅度形态变化,复合高频脉冲可以降低其变化幅度,提高挺度。Aiming at the improvement of arc stability in low current TIG,a power supply which could supply direct current superposed highfrequency pulse current was developed.By testing waveform of output current and collecting arc morphology with a high-speed photography system,small current arc characteristics and influence of DC superposed high-frequency pulse on extremely small current arc and 6 mm gap micro-arc were studied.Forming causes of micro-TIG arc characteristics and high-frequency pulse effect were discussed.The results showed that the power supply could rapidly transform,and it had characteristics of high accuracy and stable output.As the current decreased,arc morphology changed and did not remain“bell-shaped”.High-frequency pulse current could improve stability of micro-TIG arc,so that the arc could maintain stable combustion when the average current was as low as 2 A.When the arc length reached 6 mm,8 A micro-TIG arc would experience a large morphology variation,and high-frequency pulse could reduce its amplitude of variation and improve arc stiffness.

关 键 词：高频脉冲 焊接电源 微型钨极氩弧焊 电弧稳定性 

分 类 号：TG403[金属学及工艺—焊接]