Influence of low-pulsed frequency on arc profile and weld formation characteristics in double-pulsed VPTIG welding of aluminium alloys. (October 2020)

• Record Type: Journal Article
• Authors: Wang, Yipeng; Cong, Baoqiang; Qi, Bojin; Chen, Xin; Yin, Yuhuan; Lin, Sanbao
• Is Part Of: Journal of manufacturing processes. Volume 58(2020)
• Page Start: 1211
• Page End: 1220
• Publication Date: 2020-10
• Subjects: Welding arc -- Double pulses -- Weld formation -- Tungsten inert gas welding -- Aluminium alloy; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2020.09.025
• Languages: English
• ISSNs: 1526-6125

Abstract

Abstract: AA2219 aluminium alloy plates were processed by double pulsed variable polarity tungsten inert gas (DP-VPTIG) welding, and the influence of low-pulsed frequency on arc profile, weld appearance and penetration characteristics were investigated. An image processing algorithm was proposed for arc edge extraction and arc feature sizes acquisition. The arc energy equations in low-frequency pulse peak stage ( t p ) and base stage ( t b ) were established based on the electrical parameters. The arc profile periodically expanded in t p and shrunk in t b, resulted from the difference in arc energy of the two stages. The pulsation effects in arc profile, weld appearance and penetration, caused by the pulsed arc were observed to exhibit a decreasing trend with the increase of low-pulsed frequency ( f L ). The pulsation effects were obvious when f L was 0.5 Hz, then became weak and tended to disappear as f L increased above 3 Hz. The empirical correlations between f L and the pulsation effects of arc profile, weld appearance and penetration were respectively developed. It is recommended to use f L in the range of 1–2 Hz to properly exert the low-frequency pulsation effect. The results provide a valuable basis for controlling and optimizing the DP-VPTIG process in the high efficiency welding of aluminum alloys.