Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 128, Issue 5, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-022-05531-y
Keywords
Welding; Arc oscillation; Magnesium; Dendrite remelting; Phase-filed method
Funding
- National Natural Science Foundation of China [52075201, 52188102]
- Postdoctoral Science Foundation of China [2020M682407]
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Based on two-dimensional phase-field simulations, this study demonstrated the evolution of solidification morphologies during gas-tungsten arc welding of Mg-4.0 wt% Al magnesium alloy with transverse arc oscillation. It was found that the reheating caused by arc oscillation can result in dendrite fragmentation, and the oscillation frequency can significantly affect the solidification morphologies during welding.
Based on two-dimensional phase-filed simulations, we demonstrated how the solidification morphologies evolved during gas-tungsten arc welding of Mg-4.0 wt% Al magnesium alloy with transverse arc oscillation. Results showed that reheating caused by arc oscillation can cause dendrite fragmentation by remelting/pinch-off of sidebranches. Furthermore, the effects of arc oscillation frequency on the solidification morphologies during welding were investigated. We found that the oscillation frequency can significantly alter the reheating time duration during cooling, affect the sidebranches' pinching behavior, and influence the formation of the dendrite fragments. Results from this research are consistent with previous experimental results.
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