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采用反极性弱等离子弧堆焊设备将铝青铜堆焊在铸铁表面,以此提高铸铁的耐磨性和密封性。堆焊后,对堆焊层的硬度、耐磨性、显微组织以及界面的结合情况进行了分析,探究不同堆焊工艺参数下堆焊层组织、性能的变化规律,最终确定最佳堆焊工艺参数。结果表明,当堆焊电流为110 A时,堆焊层的硬度最大,为233.7 HV,当堆焊电流为120 A时,堆焊层磨损量最小,为0.0116 g;堆焊电流的增大可以减少界面氧化物的数量,改善堆焊层界面的结合情况,但是电流过大也会使显微组织变得粗大,降低堆焊层的力学性能。
The use of reverse polarity weak plasma arc welding equipment will be aluminum bronze surfacing in the cast iron surface, in order to improve the wear resistance and sealing of cast iron. After surfacing, the hardness, wear resistance, microstructure and interfacial bonding of the surfacing layer were analyzed to explore the changing rules of the surfacing layer structure and properties under different surfacing parameters, and finally to determine the best surfacing Process parameters. The results show that the maximum hardness of surfacing layer is 233.7 HV when the welding current is 110 A, and the minimum amount of surfacing layer wear is 0.0116 g when the welding current is 120 A. The increase of surfacing current can be Reduce the amount of interface oxides and improve the bonding of surfacing layer interface, but the current is too large will make the microstructure becomes coarse, reducing the mechanical properties of surfacing layer.