Reconditioning and hardening of mining equipment hydraulic cylinder working surfaces by using of double-electrode cladding

Abstract

Abstract For high-performance and high-quality reconditioning of the working surfaces of the hydraulic cylinders of mining equipment, technology is required that allows you to recondition the surface of the part that meets high requirements for accuracy of shape, hardness and roughness. There are several approaches to obtain the required properties. Comparative overview of the specifics of various approaches showed that arc cladding is the most effective and easiest way to recondition the geometric shape of a part applying to mining industry. It is interesting to obtain a weld metal with the structure of metastable austenite, which special properties allows to reach needed hardness and roughness of the cladded layer’s surface by subsequent surface rolling with plastic deformation. Unfortunately, to obtain the structure of metastable austenite it is needed low dilution rate of the base metal in the cladded metal, that is the reason to realize two layers cladding, which significantly reduces productivity of the method. In order to reduce the required number of cladded layers and obtain the structure of metastable austenite already in the first layer it could be applied multi-electrode processes – double-electrode cladding.