Laser Beams for Surface Engineering
Laser beams can alter the surface properties of materials with great precision, low heat input. CO 2 , Nd:YAG and diode lasers are used for surface engineering. These applications include:
- Non-melting, e.g. transformation or shock hardening
- Melting, e.g. glazing, homogenisation, refining and polishing
- Melting with the addition of material, e.g. cladding or alloying (with powder or wire feed)
- Laser assisted direct metal deposition (DMD) for repair, original part-build and rapid prototyping
Benefits and Applications of Laser Surface Engineering
Lasers offer many benefits for surface engineering, including localised treatment, low thermal distortion, control of treatment depth and the ability to address complex shapes. Typical applications of laser surfacing include:
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hardening and cladding engine cam shafts or valve seats |
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repair and cladding turbine blades |
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hardfacing steam turbine blades |
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hardening and cladding pumps, valves and tubular components |
Surface Modification with Tailored Heat Sources
To provide very controlled surface modification the energy distribution within the laser beam may need to be 'tailored' to a specific application. This is not always possible using conventional laser beam focusing optics. TWI has carried out extensive work with diffractive optics, to shape the laser beam into a complex profile for critical components.
Contact:
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Laser and Sheet Processes Group
TWI Ltd Granta Park Gt Abington Cambridge, CB21 6AL (previously CB1 6AL), UK |
email: lasers@twi.co.uk Tel: 01223 899000 Fax: 01223 890661 |
Copyright ©2008 TWI Ltd
