论文部分内容阅读
一、前言就焊接构件来说,在施焊过程中,由于构件局部加热和冷却不均匀,致使焊接构件内部产生残余应力。焊接残余应力对塑性较好的钢材,虽不影响构件在静载作用下的强度;但会降低构件的刚度、降低抗疲劳的能力,有可能与载荷共同作用下形成过大的应力集中,或者造成双向或三向应力状态,是形成脆性断裂的内在因素。对于较重要的构件,焊后需要机械加工,保持该构件尺寸和形位的稳定性,时效处理是其主要一环。如不进行时效处理,加工后产生变形,致使构件丧失其使用价值;或者由于其变形影响丧失其承载能力。残余应力时效方法很多,不外有冷态与热
I. INTRODUCTION As far as welding components are concerned, during the welding process, due to the uneven heating and cooling of the components, residual stresses are generated in the welding components. Welding residual stress on the good plasticity of steel, although it does not affect the strength of the component under static load; but will reduce the rigidity of components, reduce the ability of anti-fatigue, may be formed under the action of the load with excessive stress concentration, or Cause two-way or three-state stress state, is the formation of brittle fracture of the internal factors. For the more important components, the need for machining after welding, to maintain the stability of the size and shape of the component, aging is the main part. If not aging treatment, deformation after processing, resulting in the loss of its value of the use of components; or because of its deformation loss of its carrying capacity. Residual stress aging many ways, but there is cold and heat