Research on the mechanical properties of the welding area on the roller surface of the roller press

Due to the difference in properties between the metal deposited on the roller surface and the substrate material, the wear-resistant layer of the metal deposited on the roller surface may peel off, which cannot meet the working environment of the roller press under harsh high stress conditions. Therefore, four different types of welding rods were selected to prepare flux cored welding wires, and the mechanical properties of the area after the welding rod and the roller press roller surface were studied. Select Q345 steel plate, which is closest to the roller surface material, as the substrate material. Four types of welding rods, including high chromium and high manganese, titanium carbide, high chromium cast iron, and niobium containing, are selected for overlay welding of the substrate material. Analyze the mechanical properties of the overlay welding area from the aspects of bonding strength, microstructure, shear strength, tensile strength, and wear quality. According to the experimental results, it can be seen that after using high chromium and high manganese welding rods to weld the substrate material, the bonding strength between the overlay area and the substrate material is the highest. In terms of microstructure, the toughness of the bonding position is higher after using high chromium and high manganese welding rods, making it easier to form hard phases during the welding process. The shear strength can reach up to 15KN, the tensile strength can reach 436.2MPa, the elongation rate is 29.3%, and the loss of area wear quality does not exceed 15g. It has high hardness and wear resistance, and can resist the high wear and high impact high-strength wear borne by the roller surface of the roller press during work, which is conducive to ensuring the long-term stable operation of the roller surface.