Abstract
Triple-wire gas indirect arc welding (TW-GIA) is a new high-efficiency technology with low heat input and high deposition rate. However, the research on the arc conductive channel and energy transfer characteristics of TW-GIA is not deep enough, which makes it impossible to accurately adjust the heat transfer and restricts the further application of this technology. In this paper, the spectrometer was used to collect arc spectral information, the Boltzmann diagram method was adopted to estimate electron temperature and electron density, and physical models were constructed to discuss the heat transfer mechanism. The results show that the conductive channel of TW-GIA is established between the main wire and the side wires. Due to the coupled magnetic field generated by the two current branches, the Lorentz force on the TW-GIA arc plasma is directed towards the extension of the main wire, resulting in the arc to be compressed in the X-axis and elongated in the Z-axis as the welding current increases. The electron temperature gradient an “inverted cone” characteristic, which can be divided into high-temperature area (HTA), low-temperature area (LTA), and peripheral area (PA). The ranges of HTA and LTA both expand with the increase of welding current, and the size ratio of HTA to LTA is gradually increased. Due to the reduction of electron density and contact area, the heat-affected zone width with three areas is smaller than that of GMAW, and the average temperature around the weld is reduced by 24.3%, 31.8%, and 45.9%, respectively, when adopting HTA, LTA, and PA.
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This work was supported by the National Natural Science Foundation of China (No. 52175290).
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Liming Liu: conceptualization, funding acquisition. Zeli Wang: operational experiments, methodology, writing-original draft, formal analysis. Xinze Lv: assist experiment, validation. Runtao Liu: language translation. Tianyi Zhang: data calculation.
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Liu, L., Wang, Z., Lv, X. et al. Analysis of conductive channel and heat transfer mechanism of triple-wire gas indirect arc welding. Int J Adv Manuf Technol 123, 1285–1296 (2022). https://doi.org/10.1007/s00170-022-10230-2
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DOI: https://doi.org/10.1007/s00170-022-10230-2