gas shielded metal-arc welding

例句：

1. 1.The gas-shielded metal arc welding process is widely used in the construction industry.
   气体保护金属电弧焊接过程在建筑业中广泛应用。
2. 2.The gas-shielded metal arc welding technique has been improved significantly over the years.
   气体保护金属电弧焊接技术经过多年的改进，已显著提高。
3. 3.Gas-shielded metal arc welding is a reliable method for connecting pipes and fittings together.
   气体保护金属电弧焊接是一种可靠的方法，用于连接管道和配件。