19 June 2003 Comparison of multifeed and off-axis high-power diode laser (HPDL) cladding
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Proceedings Volume 4973, High-Power Diode Laser Technology and Applications; (2003) https://doi.org/10.1117/12.478367
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States
Solid solution strengthened cobalt based Stellite 21 hardfacing layers produced by off-axis and newly developed HPDL multi-feeder cladding techniques were compared. The properties studied include thickness of the heat-affected zone (HAZ), dilution, microstructure, microhardness and powder catchment efficiency. Both off-axis and multi-feeder cladding techniques were found to give pore and crack-free coating layers metallurgically bonded to the substrate. Energy dispersive spectroscopy (EDS) studies indicated that only a limited amount of dilution took place in all the coatings. Microhardness values (HV1) were observed to be in the range of 360 - 387 HV1 in as-laser-clad condition. Due to more stable cladding process and use of two side feeders, which produced more homogenous powder cloud along the laser beam axis and more accurately focused powder stream to the rectangular laser beam spot, multi-feeder cladding technique was more efficient in terms of powder catchment efficiency, which was at a level of 62 - 65 %. Both powder-feeding techniques produced relatively high heat input into the workpiece. Multi-feeder cladding technique produced smoother and less oxidised surface quality than off-axis technique, because shielding gas flow was implemented differently.
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Jari Tuominen, Jari Tuominen, Paul Hayhurst, Paul Hayhurst, V. Eronen, V. Eronen, Petri Vuoristo, Petri Vuoristo, Tapio Mantyla, Tapio Mantyla, } "Comparison of multifeed and off-axis high-power diode laser (HPDL) cladding", Proc. SPIE 4973, High-Power Diode Laser Technology and Applications, (19 June 2003); doi: 10.1117/12.478367; https://doi.org/10.1117/12.478367

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