厄瓜多尔CCS水电站配水环管残余应力检测

以厄瓜多尔CCS水电站配水环管现场焊缝热影响区的焊接残余应力检测为例,介绍了焊缝残余应力的检测方法及运用标准,对检测结果进行了分析,为今后类似工程的残余应力检测提供了可借鉴的经验。

电站压力钢管凑合节焊缝的应力试验

通过对某电站压力钢管与蜗壳凑合节合拢焊缝的焊接全过程进行拘束应力监测和焊接残余应力测试,得出拘束应力和焊接残余应力处于正常水平的结论,由此掌握合拢焊缝的拘束应力情况和锤击法消除焊接应力实际效果,确保合拢焊缝焊接的顺利实施。

海上风机塔架的振动和超声波时效技术应用

介绍了海上6 MW-100 m风力发电机组塔架的主要技术参数,通过振动时效和超声波冲击时效工艺在该项目的实际应用,说明该项技术能在消除塔架焊接残余应力中取得明显的效果,对同类风力发电机组塔架的制造有一定的借鉴意义。

3D finite element analysis of the residual stresses in butt-welded plates with modeling of the electrode-movement

In this paper the residual stresses in a butt-welded plate of 2.25Cr 1Mo has been analyzed using a 3D and transient finite element (FE) model.Also the effect of the welding-electrode speed has been studied using death and birth of FEs.For this purpose,a coupled thermo-mechanical FE solution has been used to obtain the temperature distribution and the resulting residual stresses.Also,the variations of the physical properties of the material with temperature have been taken into account.Results show that the residual stresses in the heat affected zone (HAZ) are maximum and change along the weld and also in the plate-thickness.It has been shown that use of the 3D and transient model will lead to more accurate and realistic results which are well compared with the experimental test data.