拘束焊T形接头的拘束长度与面外拘束力

Restraint Length and Out-of-Plane Restraint of T Joint Under Restranint Welding

关键词:  T形接头  角变形  拘束力  弹塑性弯曲理论

Key words:  T joint  angle deformation  restraint  elasto plastic bend theory

摘要:

合理采用拘束焊与反变形工艺措施,能有效地消除焊接残余变形。但是由于焊接结构应力场的复杂性,使得精确计算拘束力、拘束长度和反变形量值很困难。研究表明,T形接头的角变形沿焊缝长度方向是变化的。在短焊缝情况下,可以近似认为角变形为常数。拘束焊时,焊缝与近缝区材料处于塑性状态,而距焊缝较远处的材料仍处于弹性状态。作者应用弹塑性弯曲梁理论提出了一种消除焊接T形接头角变形的面外拘束力计算模型,计算了临界拘束长度、极限拘束力与反变形的量值,并通过试验验证了计算方法的有效性。该方法可以推广应用于长焊缝的情况。

Abstract:

It can remove residual welding deformation effectively to use technology of restraint welding and reverse deformation.But,it is very difficult to calculate values of restraint,restraint length and reverse deformation accurately,because of the complication of stress fields in welded structure.Study showed that angle deformation of T joint is changed along the welded seam length.In the case of a short welded seam,it is approximatele constant.Under restraint welding,the material is plastic in the place of welded seam and nearness.But in the distance the material is elastic.By theory of elasto-plastic bend,this paper provides the model to calculate out-of-plane restraint to remove angle deformation in T joint.The values of the critical restraint length,limit restraint and reverse deformation have been calculated.The results of tests show that the calculation method is effective.The method can be generalized for the case of a long welded seam.