本文对高压汽轮机汽缸裂纹补焊技术中存在的两个主要问题——预热和热处理问题,分别提出了现实可行的方法,即: 1.无变形工频感应预热的方法。用这种方法在预热温度范围内加热,可以使经过精加工的汽缸不产生残余变形。 2.跟踪回火的方法。用这种方法处理每一焊道,不但可以使补焊区的金属性能和残余应力与一般回火处理基本相同,而且不致因回火处理而增大工件的变形量。 In this paper, there are two main problems existing in high-pressure steam turbine cylinder crack repairing-preheating and heat treatment. Some feasible methods are proposed respectively: 1. In this way, the preheat temperature range of heating, can make the finished cylinder without residual deformation. 2. Tracking method of tempering. With this method of processing each weld bead, not only can make the weld zone metal properties and residual stress is basically the same with the general tempering, and not due to tempering and increase the deformation of the workpiece.