lmp01 an introdution

7/29/2019 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
http://upload.wikimedia.org/wikipedia/commons/a/a0/Military_laser_experiment.jpg


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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

lmp01 an introdution

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