Direct Diode Laser Cladding of Co based Alloy to Dual Phase Stainless Steel for Repairing the Machinery Parts

摘要

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 3kW 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 CO_2 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