摘要
基于自主研制的Si C MOSFET快频脉冲焊接电源系统,提出一种钛合金"快频脉冲柔性波形调制"TIG焊接技术。快频脉冲焊接电源采用Si C MOSFET作为逆变功率器件,大幅提高电源的逆变频率和动态响应特性,加强高频段电弧控制效果,实现了20k Hz规整快频脉冲柔性电流波形的稳定输出。将快频脉冲柔性波形调制TIG焊技术应用于钛合金TC4焊接过程,研究结果表明:与传统脉冲TIG焊对比,快频脉冲柔性波形TIG电弧收缩效果明显,电弧径向尺寸显著减小;快频脉冲柔性波形调制TIG焊技术具有显著的细化焊缝晶粒和减少热影响区粗化的效果,钛合金焊缝晶粒尺寸减小了约71%。
Based on the self-developed Si C MOSFET interpulse welding power supply system, a novel flexible waveform interpulse welding technology is proposed. The Si C MOSFET is used as the inverter power device, which improves the inverter frequency and the dynamic response of the power supply. The interpulse welding power supply enhances the control effect of high-frequency arc to reach high stability in output of the regular and flexible current waveform of the interpulse at 20 k Hz. The method is applied to the welding of titanium alloy TC4. Compared with the conventional pulsed TIG, the arc radial dimension of the interpulse TIG is reduced, and the grains in the fusion zone and HAZ of the weld are significantly refined. The average grain size in the fusion zone is decreased by 71%.
作者
吴健文
徐孟嘉
范文艳
陈浩宇
江东航
王振民
WU Jianwen;XU Mengjia;FAN Wenyan;CHEN Haoyu;JIANG Donghang;WANG Zhenmin(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2020年第6期102-109,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(51875212)
广东省科技计划(2018A030313192,2019B090919002)
广州市国际合作(201807010035,2019070110006)资助项目。
