Laser Cladding Impeller Shroud Manufacturing

The patent replaces the welding process (thermal field) with a laser cladding process that uses controlled metal deposition and rapid solidification. This substitution eliminates the excessive thermal input that causes fillet portion deformation while still achieving strong joining between the shroud and impeller blades through direct metal bonding.

The patent changes the thermal parameters by using laser cladding instead of conventional welding. The laser process provides concentrated, controlled thermal input with rapid cooling rates, which prevents the excessive heat accumulation that causes fillet portion distortion in traditional welding, while maintaining adequate joining strength.

The patent replaces conventional welding with laser cladding technology. This substitution allows the process to handle thick shrouds in large-sized impeller assemblies by providing controlled, concentrated energy input that melts and bonds material without generating the excessive thermal fields that cause deformation in traditional welding processes.

The laser cladding process applies thermal energy in a segmented, localized manner rather than as a broad thermal field. This segmentation of energy input allows the thick shroud to be processed without uniform thermal expansion and deformation, maintaining structural stability while enabling manufacturing of large-sized assemblies.

The patent replaces the vacuum brazing process with laser cladding. This substitution eliminates the need for filler materials and achieves direct metal-to-metal bonding between the shroud and impeller blades, resulting in superior adhesive strength comparable to or exceeding conventional welding, while maintaining the advantage of localized thermal input that prevents base material damage.

The laser cladding process creates a composite structure where the cladded metal forms a strong metallurgical bond with the base material. This composite approach eliminates the intermediate filler material layer used in brazing, achieving direct bonding with higher strength while the controlled laser parameters prevent excessive thermal damage to the base material.

The laser cladding process enables precise control of the fillet portion dimensions and geometry through parameter optimization. The process can create fillet portions with radii larger than 0.8 mm while maintaining precise joining, and the gradual transition of material provides stress distribution that reduces stress concentration, making it suitable for large-sized products.

The patent replaces conventional joining methods that create small, stress-concentrated fillets with laser cladding that can create optimized fillet geometries. The controlled deposition and solidification process allows for larger, more gradual fillet transitions that reduce stress concentration while maintaining joining precision, enabling application to large-sized impeller assemblies.