weld [weld]

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vt.焊接，锻接；vi. 焊牢；n.焊接，焊缝

to join two pieces of metal together permanently by melting the parts that touch

Where did you learn to weld? 你在哪儿学会的焊接技术？
It takes speed and skill to weld steel at this heat. 在这样的温度下焊钢需要速度和技术。