Abstract
Cladding is an alloy layer that is superior in abrasion resistance by spraying, overlay welding, laser cladding or the like on its surface in case of abrasion due to repeated abrasion, impact, corrosion. Laser cladding is a process in which a clad material and a part of a substrate are melted with a high power laser beam to form a coating layer completely metallurgically bonded to the substrate. In this study, laser cladding was performed using Co-based LC-190 alloy powder for hard facing of ship exhaust valve. One-pass cladding was performed by varying the preheating temperature, laser output and beam feed rate of the base material using a diode laser with a maximum output power of 8.0 kW. The shape, dilution rate, Characteristics were observed. As a result, defects could be suppressed by applying preheating, and as the heat input increased, the width of the clad layer increased and the height decreased. In addition, the average hardness value was gradually decreased as a result of hardness measurement, and it was found that dilution was increased by EDS component analysis. Key words: Hardfacing, Laser cladding, LC-190, Preheating temperature
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