Analysis and Control of Welding Deformation in Qinshan Nuclear Power Phase Ⅱ Extension Project

The paper analyzes the severe deformation in the welding of core barrel in Qinshan Nuclear Power Phase II Extension Project Reactor 3_# unit,which nearly induces the loss of the function of the core barrel.Measures such as improving the welding fixture,process and parameter,and loading the counterweight is taken for the 4_# unit to minimize the deformation,and the result shows that the weld of the 4_# core barrel satisfies the design requirements.