three-phase low frequency welder

例句：

1. 1. Thisthree-phase low frequency welderis very efficient in cutting metal.
   这种三相低频焊机在切割金属方面非常高效。
2. 2. The technicians used this welder to repair the damaged parts ofthe machine.
   技术人员使用这种焊机来修理机器的损坏部分。
3. 3. Thewelder was designedfor use in industrial settings wherehigh-quality welding isrequired.
   这种焊机是为工业环境中需要高质量焊接而设计的。