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阐述了 300 MW发电机组空气预热器着火烧坏的重要部件的修复过程，为解决承重梁、转子的结构强度等问题，对焊接结构变形及修复部件的特性进行分析，确定了合理的焊接工艺，获得了满意的焊接质量。对同类空预器的检修及钢结构的焊接有较好的示范作用。
The repairing process of the important components of the air preheater in 300 MW generator set is discussed. In order to solve the problems such as the structural strength of the bearing beam and the rotor, the deformation of the welded structure and the characteristics of the repaired components are analyzed, and the reasonable welding process , Got a satisfactory welding quality. The same type of air preheater overhaul and steel structure welding has a good example.