series-spot welding

例句：

1. 1.The engineer used a series of techniques to improve the quality of the welding process.
   工程师使用了一系列的技术来提高焊接过程的质量。
2. 2. In this particular case, spot welding was used to reinforce the joint between two pieces of metal.
   在这个特定的情况下，点焊被用来加固两块金属之间的接合处。
3. 3. The manufacturer recommends using a series of tools for proper welding and cutting operations.
   制造商推荐使用一系列工具来进行适当的焊接和切割操作。