butt welding

例句：

1. 1.The steel butt weld is strong enough to support the weight of a car.
   这个钢的但焊足够强壮来支撑汽车的重量。
2. 2. Butt welding is a skill that requires years of practice and experience.
   但焊是一项需要多年练习和经验的技能。
3. 3.In this case, butt welding was used to reinforce the structure.
   在这种情况下，但焊被用来加固结构。