Numerical simulation and experimental study on the composite process of submerged arc cladding and laser cladding

Submerged arc surfacing is a welding technology that can realize large-scale repair, and its surfacing layer has good adaptability for alternating stress conditions. Therefore, the surfacing welding technology is widely used in the roll remanufacturing of the metallurgical industry. However, the thicker surfacing structure, severe alloy segregation, and high dilution rate make some application limitations to this technology. Laser cladding is an emerging environment-friendly surface strengthening technology with rapid heating and cooling. It can obtain a refined microcrystal structure, high bonding strength, small heat-affected zone, and low dilution rate. Combining submerged arc surfacing and laser cladding technology can realize the two processes complement. However, there are relatively few researches on the composite process of the two. The numerical simulation and experimental study on the composite process of submerged arc surfacing and laser cladding can quantitatively reveal the transient mechanism and composite mechanism of physical and metallurgical behavior in remanufacturing, which is significant to promote the wide application of composite technology. In this paper, a thermo-elastic-plastic coupling model of roll submerged arc surfacing process was established, which reveals the evolution law of welding temperature and stress in surfacing welding. Annealing the rolls after welding, and a laser cladding multi-field coupling model was established on the surfacing layer. The surfacing welding process was calculated by the Arbitrary Lagrangian-Eulerian and elastoplastic material model. The transient laws of laser cladding temperature, molten pool flow rate and surfacing layer stress are studied in this arcle. Based on the numerical model, the physical experiments of composite process for submerged arc surfacing and laser cladding were carried out, and the temperature and stress were measured and compared. It can be seen from the numerical simulation that the temperature of submerged arc surfacing is lower than that in the cladding process, and the stress produced by surfacing process is also lower than that of the cladding process. The experimental results show that laser cladding makes up for the defects existing in surfacing, and the composite process improves the surface quality of the substrate. This research can lay a theoretical foundation for parameter optimization under the composite process.