对高压油缸支座锻件模具进行了堆焊修复研究。选用进口堆焊材料9650对热作模具钢5CrNiMo进行堆焊,对堆焊后覆层组织和性能进行了研究。结果表明:焊态下基体与焊材之间由于碳含量差异,熔合区有脱碳层的存在,覆层组织不均匀;热处理的温度和时间对覆层组织与性能都有较大影响。回火温度550℃、回火时间3 h时,覆层的组织和性能最佳,修复后模具寿命提高50%。 Research on high pressure cylinder support forging die repair welding. Choose imported surfacing material 9650 for hot work die steel 5CrNiMo surfacing, cladding layer after welding performance and performance were studied. The results show that due to the difference of carbon content between the matrix and the welding consumables, there is a decarburized layer in the fusion zone, and the coating structure is not uniform. The temperature and time of the heat treatment have a great influence on the microstructure and properties of the coating. When the tempering temperature is 550 ℃ and the tempering time is 3 h, the microstructure and properties of the coating are the best, and the service life of the mold is increased by 50% after the repair.