Experimental study on repairing of damaged cast iron cylinder heads by 3D printing arc welding system

摘要

To realize repairing of damaged cast iron cylinder heads by 3D printing arc welding system mainly composed of an industrial robot and an arc welding machine, the remanufacturing process flow of 3D printing arc welding system was introduced, and a single straight wall stacking experiment was designed. The effects of process parameters on the appearance quality and mechanical properties of welding pieces were studied. The forming laws of welding piece were obtained. The main conclusions include: The higher the preheating temperature, and interlayer temperature, the more obvious the effects of process parameters on the hardness of welding pieces, and the effects of preheating temperature are more evident than that of interlayer temperature. With the increase of layer number, the hardness of welding pieces decreases gradually. When welding piece is lower than eight layers, the rise of width and height of the welding piece is approximately proportional to the increase of layers. Those conclusions of this paper provide general guidance and technical support for the repairing of cast iron cylinder heads and welding of other cast iron parts.