LMP01 an Introdution
Transcript of LMP01 an Introdution
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Laser Applications in ManufacturingLaser Processing of Materials:
An Introduction
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Laser Beam Properties:-
Coherence
Monochromaticity Low Beam Divergence
High Power
Tunability
Ultra-short duration pulse
Heat Cool
Cut Weld
Communicate ComputeCure Destroy
Detect Measure
Entertain Separate
Write ReadStore data & Information
LASER: Unique Source of Light
Laser: A Tool of UnprecedentedPrecision & Power
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Some Typical Laser material processing applications
Internal views of diesel fuel injector nozzles drilled using
Oxford Lasers
Laser Drilling in Turbine vanes
French et al. ICALEO 2003
A laser drilled injector with 60 degree orifice angles
www.oxfordlasers.com_files_laser_drilling_fuel_injection
www.metalase.com_Clarke-Profeta Paper
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Laser Material Interaction
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Laser Material Processing
Heating
Melting
Evaporation
Ablation
Plasma formation
Shock wave generation
Laser Power Density
103- 1012 W/cm2
A laser beam focused on amaterial generates very highpower density capable of
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Principle characteristics of laser material processing
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Laser Material Processing Parameters Characteristics of Laser Beam
Laser Beam
Power (CW, Pulsed, Modulated)
Mode, Polarization,
Wavelength, Pulse duration
Nozzle:
Conical,Cylindrical,
Supersonic
Shrouding gasComposition &
Pressure
Shroud Design
Processing gasType & Pressure
Externally added materialComposition Properties,
Flow rate
Focal Spot
SizeLocation
Relative motion,
Speed
Direction w.r.t. Beam Polarization
Material Properties
Forces on molten pool: Marangoni typeType of
Processing
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Syllabus: Laser Processing of Materials(ME60302)/ Laser Applications in
Manufacturing(MF41616)
Basics of laser: Stimulated Process, Population Inversion, Laser beam
characteristics and different operating modes
Important industrial lasers: CO2, Excimer, Nd:YAG, Diode, Fiber and Ultra-short pulse lasers;
Laser beam delivery systems.
Laser processing fundamentals: Laser materials interaction Ultra-short laser
pulse interaction, heat flow theory and metallurgical considerations.
Laser Material Processing Applications: Laser cutting and drilling;Laser welding,
Laser surface modifications: Heat treatment, surface remelting, surface alloying
and cladding, surface texturing,
LCVD and LPVD.
Laser rapid manufacturing. Laser metal forming, Laser Shock peening;Theoretical modeling of laser material processing;
Economics of Laser Applications in Manufacturing;
Laser Safety: Laser safety standards and safety procedures.
Overview of Other Industrial & Scientific Applications of laser: Metrological
applications, Holography (Non destructive Testing), Laser Isotope Separation,
Laser fusion.
Laser Micro- &
Nano-Machining
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Reading Materials:
Lecture Notes
Laser Material Processing: W M Steen & J Mazumdar, 4th Ed.,Springer
(Available on web of Our Library)
Principles of Laser Materials Processing by Elijah Kannatey - Asibu Jr.Wiley publication 2009.
Industrial Applications of Lasers: J F Ready
Laser Fabrication and Machining of Materials: Narendra B. Dahotre &Sandip P. Harimkar
(Springer Available on web)
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Evaluation:
TA: 20Two Class Tests4 Assignments2-3 Quiz Tests
Attendance
Mid Sem: 30
End Sem: 50