Optimized welding technique for NiMoV rotors for high temperature applications

摘要

A welding process of repairing a ferrous NiMoV low alloy steel turbine component. A first and a second layer of weld material are welded to the turbine component at electrical current levels chosen so as to prevent a substantial decrease and a substantial increase in the hardness of the component. This method involves selecting these electrical current levels. Additionally, this invention relates to selecting appropriate electrical current levels that minimizes the difference between a maximum and a minimum level of hardness while welding a first and a second layer of weld material. This invention also includes a method for preventing a substantial decrease in the hardness of the component as a result of the welding process.