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目前,工程机械、桥梁、建筑结构中承受疲劳荷载的钢结构,广泛采用焊接连接。焊接结构连接具有施工简单和快速的优点。但焊接接头处往往残存着很高的残余应力,这些应力是在火焰切割、焊接和变形校正过程中产生的。残余应力的存在,使接头疲劳强度降低40～50%,导致结构过早疲劳破坏。为了避免残余应力的不利影响,常采用退火消除应力的措施,
Currently, construction machinery, bridges, structural fatigue fatigue load in the steel structure, the widespread use of welded connections. Welded structural connections provide the advantages of simplicity and speed of construction. However, weld joints often remain high residual stress, these stresses are in flame cutting, welding and deformation correction process. The existence of residual stress reduces the fatigue strength of joints by 40-50%, leading to premature fatigue failure of the structure. In order to avoid the adverse effects of residual stress, often using annealing to eliminate stress measures,