焊接是一种运用加热或加压手段、添加或不添加填充材料将构件不可拆卸地连接在一起或在基表面堆敷覆盖层的加工工艺。构件因焊接而产生的内应力称之为焊接应力,按作用时间可分为焊接瞬时应力和焊接残余应力。焊接过程中,某一瞬时的焊接应力称之为焊接瞬时应力,它随着时间而变化。焊后残留在焊件内自身相互平衡分布的焊接应力称之为焊接残余应力。 Welding is the use of heat or pressure means, with or without added filler material will be non-detachable components together or stacked on the base surface of the coating process. Components due to welding internal stress is called the welding stress, according to the role of time can be divided into welding instantaneous stress and welding residual stress. Welding process, a moment of the welding stress is called the welding instantaneous stress, it changes over time. Welding residual in the welding pieces of their own balance between the distribution of the welding stress is called welding residual stress.