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1. The engineer used a backhand welding technique to join the metal parts together.
工程师使用背手焊接技术将金属部件连接在一起。
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2.In this workshop, we'll learn how to perform reverse welding on a piece of metal.
在这个车间里，我们将学习如何对一块金属进行反向焊接。
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3. The reversed welding process is more time-consuming but produces stronger joints.
反向焊接过程需要更多的时间，但能产生更牢固的接头。