脉冲频率对TCGMAW熔滴过渡行为的影响

Effects of pulse frequency on TCGMAW droplet transfer modes

采用高速摄影与电信号小波分析研究了双丝共熔池熔化极气体保护焊(TCG-MAW)脉冲频率变化对焊接过程熔滴过渡方式和频率及焊缝成形的影响.结果表明,在文中焊接工艺参数下,脉冲频率较高(140 Hz)时,前丝熔滴过渡方式为射流过渡,后丝为射滴过渡;脉冲频率较低(40 Hz)时,前丝、后丝熔滴过渡方式均为射滴过渡;脉冲频率中等(60～100 Hz)时,前丝、后丝熔滴过渡方式均为射流过渡;脉冲频率在40～140 Hz变化时,前丝、后丝熔滴过渡基本上表现为一脉一滴形式.当脉冲频率大约在60～100 Hz变化时,焊缝成形较好.

The effects of pulse frequency on TCGMAW(Twin-wire Co-pool Gas-shielded Metal Arc Welding) droplet transfer modes and weld appearances were investigated with high-speed photography and wavelet analysis.Under the welding parameters in this paper,the droplet transfer mode of the front wire was spray transfer and that of the back wire was projected transfer when the pulse frequency was high(140 Hz);the droplet transfer mode of both the front and back wires was projected transfer when the pulse frequency was low(40 Hz);the droplet transfer mode of both the front and back wires was spray transfer when the pulse frequency was moderate(60-100 Hz);the droplet transfer of both the front and back wires was one-droplet-per-pulse when the pulse frequency changed between 40 Hz and 140 Hz;and the weld appearances were preferable when the pulse frequency changed between 60Hz and 100 Hz.