A series of experiments has been carried out to investigate the fibre optic Nd–YAG laser cladding of C–Mn steel with preplaced Hastelloy C powder. The beam from a pulsed Nd–YAG laser, operating at an average output power of 300 Jt: was transmitted to the workpiece via a step index glass fibre of length 5 m and core diameter 600 μm. A range of laser pulse energies, durations, and repetition rates was investigated forseveral focal length positions to determine their effect on clad layer formation and integrity. It was found that, for a limited range of process parameters, metallurgically sound clad layers up to 500 μm thick could be formed with less than 10% dilution by the substrate.
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