Laser cladding
- 1. LASER CLADDING M L N Bhargav 2016UGPI026 NIT JAMSHEDPUR
- 2. LASER • A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. • The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".
- 4. LASER Cladding • LASER claddingis a method of depositing material by which a powdered or wire feedstock material is melted and consolidated by use of a LASER in order to coat part of a substrate or fabricate a near-net shape part. • It is often used to improve mechanical properties or increase corrosion resistance, repair worn out parts, and fabricate metal matrix composites.
- 5. Mechanism of Laser Cladding
- 6. • The powder used in laser cladding is normally of a metallic nature, and is injected into the system by either coaxial or lateral nozzles. • The interaction of the metallic powder stream and the laser causes melting to occur, and is known as the melt pool. • This is deposited onto a substrate; moving the substrate allows the melt pool to solidify and thus produces a track of solid metal. • The motion of the substrate is guided by a CAD system which interpolates solid objects into a set of tracks, thus producing the desired part at the end of the trajectory.
- 7. Materials We use different welding consumables, depending on coating requirements, which are applied in powder form. Corrosion protection • Nickel-based alloys • Chrome-nickel steels High-temperature applications • Cobalt-based alloys Wear protection • Materials containing carbide ex: (NiBSi + WSC) • Iron-based alloys with different carbides
- 8. Process Parameters Some of the important process parameters of Laser Cladding are : • laser power • laser focal point • substrate velocity • powder injection • Material of substrate and powder
- 9. Applications of laser cladding: • Repair of worn components • Coating of components with materials to improve corrosion and/or wear resistance properties.
- 10. Advantages and Disadvantages Advantages: • Best technique for coating any shape • Particular dispositions for repairing parts • Most suited technique for graded material application. • Well adapted for near-net -shape manufacturing. • Low dilution between track and substrate (unlike other welding processes and strong metallurgical bond). • High cooling rate
- 11. • Low deformation of the substrate and small heat affected zone. • A lot of material flexibility (metal, ceramic, even polymer). • Built part is free of crack and porosity. • Compact technology. Disadvantages: • Relatively high equipment and maintenance cost. • Large equipment size limits portability. • Being a new technology, availability and capability are still very limited.
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