焊接是一个涉及电弧物理、传热、冶金和力学的复杂过程。
Welding is a complicated process in which arc physics, heat transfer, metallurgy and mechanics are involved.
本研究工作对水下焊接电弧物理及焊接冶金的研究有参考价值。
This research is significant and valuable to the study of underwater welding arc physics.
他由学物理改为学冶金是正确的吗？
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