摘要
为了解决传统钨极惰性气体保护焊(gas tungsten arc welding,GTAW)熔透能力较低、焊接速度小及焊接生产率低的问题,提出了超高频可调多脉冲钨极氩弧焊(ultrahigh frequency adjustable multi-pulse gas tungsten arc welding, UFMPGTAW)工艺.该工艺的焊接频率最高达到100 kHz,电流的变化速率达到150 A/μs;在脉冲焊接电流波形中引入中间值电流阶段,使单个焊接周期内产生多个电流脉冲,脉冲波形各个阶段的时间与幅值均可调;建立了超高频可调多脉冲GTAW试验平台,拍摄不同频率时的超高频焊接电弧,并与超高频普通脉冲焊接电弧进行对比,在平均电流相同的情况下,超高频电流产生的高频效应使电弧具有压缩特性,可使得焊接电弧的温度分布更集中,其中,100 kHz的UFMP-GTAW焊接电弧的温度分布最集中;最后,用Q235钢进行了焊接试验.结果表明,100 kHz的UFMP-GTAW工艺能够压缩焊接电弧,并获得更大的焊缝熔深.
To solve the problems of low penetration capability,slow welding speed,and low welding productivity of traditional gas tungsten arc welding(GTAW),the ultrahigh frequency adjustable multi-pulse GTAW(UFMP-GTAW)process was proposed.The welding frequency of this process could reach up to 100 kHz,and the current change rate reached 150 A/μs.By introducing an intermediate current stage into the pulse welding current waveform,multiple current pulses were generated within a single welding cycle,and the time and amplitude of each stage of the pulse waveform were adjustable.An experimental platform for UFMP-GTAW was established to capture ultrahigh frequency welding arcs at different frequencies,which were then compared with ultrahigh frequency ordinary pulse welding arcs.Under the same average current,the high-frequency effect generated by the ultrahigh frequency current gave the arc a compression characteristic,making the temperature distribution of the welding arc more concentrated.Among them,the welding arc of 100 kHz UFMP-GTAW had the most concentrated temperature distribution.Finally,welding tests were conducted on Q235 steel.The results show that the 100 kHz UFMP-GTAW process can compress the welding arc and achieve a larger weld penetration depth.Highlights:(1)A UFMP-GTAW process was proposed with a welding frequency of 100 kHz.(2)The ultrahigh frequency effect was utilized to compress the arc,concentrate the temperature distribution,and deepen the weld.
作者
张景璋
何广平
赵红雁
余悦
邢毅
陈树君
ZHANG Jingzhang;HE Guangping;ZHAO Hongyan;YU Yue;XING Yi;CHEN Shujun(Institute of Intelligent Forming Equipment and System,Beijing University of Technology,Beijing,100124,China;North China University of Technology,Beijing,100144,China)
出处
《焊接学报》
北大核心
2025年第8期16-27,36,共13页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(52205325)。
关键词
超高频焊接
电弧温度
脉冲GTAW
高频脉冲
ultrahigh frequency welding
arc temperature
pulsed GTAW
high-frequency pulse
