期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 129, 期 -, 页码 1110-1122出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2018.10.037
关键词
Pulsed Gas metal arc welding (GMAW-P); Phase field method; Pulse current; Pulse duration; Drop transfer; Heat transfer
资金
- Korean Ministry of Trade, Industry and Energy [10067156]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10067156] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The effect of pulsing parameters on the metal and heat transfer behaviors in pulsed gas metal arc welding is investigated by a numerical model based on the solution of the magnetohydrodynamic equations within the framework of phase field method. Five sets of current waveforms using different peak current and duration (i.e. 300 A-2.30 ms, 350 A-1.80 ms, 400 A-1.45 ms, 450 A-1.20 ms and 500 A-1.00 ms) but maintaining an identical average current (i.e. 170 A) are considered and compared. The pulses using higher current but shorter duration result in more elongated shape of the pendent drop, earlier detachment, and significantly higher velocity of the detached drop. Unlike the drop velocity, higher peak current merely leads to a slight increase in the average temperature of the detached drop. The reason for this slight increase is that only the joule heating increases with the peak current, while the sheath heating and arc heating is governed by the average current and keeps almost constant using different pulsing parameters. The simulation results are compared with the high speed photos and exhibit good agreements. (C) 2018 Elsevier Ltd. All rights reserved.
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