welds types

例句：

1. 1. The welding process is essential for the construction of bridges and other large structures.
   焊接过程对于桥梁和其他大型结构的建造至关重要。
2. 2.Different welding techniques are used to produce different parts of a machine.
   不同的焊接技术用于制造机器的不同部件。
3. 3. Welding is a complex process that requires precise control over temperature, pressure, and material properties.
   焊接是一项复杂的工艺，需要精确控制温度、压力和材料属性。