CAP1000核电堆内构件出口管嘴焊接防变形控制技术

Deformation Control Technology for Nozzle Welding of Internals Outlet in CAP1000 Nuclear Power Plant

吊篮筒体是核反应堆堆内构件的重要组成部分,设计尺寸精度要求高,其出口管嘴的焊接是影响吊篮筒体尺寸精度的重要工序。本文根据焊接变形机理,理论分析了出口管嘴焊接结构的变形规律,提出了焊前、焊接过程中及焊后的变形控制方法,设计了焊接防变形工装和焊后校形工装,确定了合理的焊接顺序,形成了完整的出口管嘴焊接防变形控制技术。该技术在CAP1000堆型产品上得到了成功应用,达到了防变形效果。

Core barrel is an important part of the reactor internals,and the design requirements are strict.The welding of the outlet nozzle is an important process in the manufacturing process of the barrel.According to the welding deformation mechanism,this paper analyzes the deformation law of the welding structure of the outlet nozzle,puts forward the deformation control method before,during and after welding,designs the welding anti deformation tooling and post welding sizing tooling,determines the reasonable welding sequence,and forms the complete anti deformation control technology of the outlet nozzle welding.The technology is successfully applied to CAP1000 stack products,and the effect of deformation prevention is achieved.