In order to minimize the welding deformation of diaphragm,the records of welding deformation are obtained through directly measuring size of the diaphragm with coroneted blades before and after welding.

This article elaborated the 200MW steam turbine Welded diaphragm distorts this domestic universal question and the harm of diaphragm distorts which brings to the unit, emphasized the necessity that Carries on welding reinforcement to the diaphragm when the diaphragm has the serious distortion , and outlined the diaphragm inspection method and the diaphragmp reinforcement craft main point.

ER410 welding wire selected and appropriate welding process should be taken,repair welding onsite of turbine diaphragm stationary blades,which material is 1Cr13.