oxy welding

例句：

1. 1. This method of welding is widely used in the construction industry.
   这种方法在建筑业中广泛使用。
2. 2. The welder was using a torch to join two pieces of metal together.
   焊工正在用焊枪将两块金属连接在一起。
3. 3. Oxygen-acetylene welding is faster and more efficient than traditional welding methods.
   氧气-乙炔焊接比传统焊接方法更快、更有效。