Welding repair method for large-sized heat-resistant steel castings

Abstract

The invention relates to a welding repair method for large-sized heat-resistant steel castings, and solves the problems that the welding stress is difficultly removed, the defects of incomplete fusion, incomplete penetration, delayed crack and slag inclusion are easily caused in a repair process and the repair quality is difficultly guaranteed as the heat-resistant steel castings are poorer in welding performance, complicated in defect position and large in workpiece in an existing manual arc welding type surfacing welding mode for repairing large-sized castings. The method mainly comprises the following steps: 1, removing the defects; 2, performing heat treatment; 3, performing dye check; 4, performing statistics on the repair welding quantity; 5, preheating before welding; 6, performing repair welding on defect parts; 7, cleaning and repairing; 8, performing post-welding heat treatment; 9, performing nondestructive inspection. According to the method, the large-area defects of the castings can be effectively repaired, the repair quality is guaranteed, the processing and use requirements of the castings can be met after repair, and the economic loss of scrapped important or major castings is reduced. The method is used for repairing the large-area defects of the large-sized heat-resistant steel castings.

Description

technical field

[0001] The invention relates to a casting welding repair method, in particular to a large-scale heat-resistant steel casting large-area defect welding repair method. Background technique

[0002] Large-scale castings often have defects such as trachoma, looseness and cracks in the process of casting and operation, and the loss of scrapping is huge. At present, manual arc welding is mostly used in China to repair them. The complex location of the repair and the size of the workpiece lead to difficulties in heat treatment and welding stress, which lead to defects such as lack of fusion, incomplete penetration, delayed cracks, and slag inclusions during the welding repair process, making it difficult to guarantee the repair quality. Contents of the invention

[0003] The purpose of the present invention is to solve the problem of using the existing manual arc welding surfacing method to repair large castings. Due to the poor weldability of heat-resistant steel...