Effects of Laser Cladding Layers Width on Total Indicated Runout Characteristics of Steam Turbine Rotor Surface

Abstract

In order to solve the wear repair problem of large steam turbine rotor shaft journal, the material of steam turbine rotor shaft was used as a substrate and the self-made special laser cladding remanufacturing powder as the experimental material, and the experiments were carried out by a laser cladding remanufacturing method based on the laser cladding remanufacturing system with coaxial powder feeder. Focusing on effect of different widths of laser cladding layers on total indicated runout (TIR) of steam turbine rotor, the experiment research and mechanism simulation verification were performed, and the influence mechanism of different factors were analyzed. The total data indicates runout are closely related to probe diameter and laser cladding layer width. The width of cladding layer determines the turbine rotor surface magnetic, eddy current density and magnetic flux density distribution. Due to the interference of matrix magnetic field and eddy current density of the surface, the magnetic flux density suddenly changes in the laser cladding layer edge when the laser cladding layer width is less than 8 mm. The measurement results are too large caused by the comprehensive effect of the substrate and the laser cladding layer. According to the numerical simulation of magnetic flux density distribution of measured metal body surface, the critical value of laser cladding width is 9.82 mm.

Fabrication, microstructure and micromechanical properties of Fe-based metallic glass coating manufactured by laser

“…In recent years, laser cladding as a new technology is applied to the surface modification of materials, such as gas turbine blades, gears [9]. On the other hand, laser cladding can also be used for surface repair products such as rotors, dies and so on [10]. Laser cladding is divided into prefabricated powder laser cladding, synchronized feeding laser cladding and wire laser cladding simultaneously [11].…”