Direct diode laser cladding of Co based alloy to dual phase stainless steel for repairing the machinery parts

Abstract

The investigation of Laser cladding of Co-based super alloy on dual phase stainless steel have been curried out to repair the mechanical parts of power plant using 3 kW direct diode laser with high efficiency and a rectangular beam profile. In the present work, effects of process parameters such as laser power output, travel speed and defocusing distance were investigated to get a sound clad layer for repairing of the parts. Comparing the clad by conventional CO2 laser and YAG laser, wide weld bead, less dilution and less distortion could be obtained in high power diode laser cladding. This repairing technique using diode laser with a small volume is desirable for practical application to the site maintenance on parts of various kinds of plants such as power plant, chemical plant, steel plant, paper plant, etc.