A Study on the Characteristics of Laser Cladding Using the LC-190 Cemented Carbide Powder(II) - Characteristic Analysis of Multi-pass Clad Layer -

Abstract

Laser cladding is a process in which metal powder and wire are melted to form a cladding layer using a laser heat source to prevent material and surface from abrasion and corrosion. Since the dissimilar metal to be added is fusion bonded at the interface, the base material is partially dissolved to form a mixed melt bonding layer, whereby the thickness and composition of the bonding layer affect the physical properties of the base material and the clad layer. At this time, dilution of the added metal and the base material is preferably limited to a very small amount. Such laser cladding has been put to practical use in exhaust valves of ship industry, turbine blades and machine parts in the field of power generation facilities, and is expected to be put to practical use in the defense industry and aerospace industry. In this study, multi-pass cladding was performed by varying the superposition ratio and the powder feed rate using a diode laser and a powder feeding method with a maximum power of 8.0 kW, and the difference of the cladding layers was compared and analyzed. As a result, as the overlap ratio increased, the width decreased and the height increased. Also, it was found that the height of the clad layer increased as the powder feed amount increased, but cracks occurred when the feed amount was excessive, and a proper powder feed amount was required.