Mechanism of laser welding, Mechanical Engineering

Assignment Help:

MECHANISM OF LASER WELDING

 

Laser welding of metals is performed with beams focused to irradiate levels in the range of 106 to 107 W / cm2. At such power densities, melting occurs in less than a millisecond. First, the radiation pressure becomes appreciable capable of supporting 0.5 mm liquid steel column. Next, the molten liquid has an appreciable vapour pressure. The metal vapour, now interacts with light through the process of inverse population, where electrons in the field of an ion may be accelerated by electromagnetic radiation. This heats the vapour, increasing the number of ions and hence the absorption. Now the plasma, which is a highly ionised gas that absorbs laser light and emits back body radiation. As long as power density is sufficient to sustain it the plasma will act as an efficient absorber.


Related Discussions:- Mechanism of laser welding

Thermodynamics, describe equivalence of kelvin planck and clausious stateme...

describe equivalence of kelvin planck and clausious statement

What do you mean by rigid bed models, Q. What do you mean by Rigid bed mode...

Q. What do you mean by Rigid bed models? Models with rigid boundary and geometrically similar form are used in studies connected with outlet works, stilling basins, spillways

Main factors to be considered when selecting material, Main Factors to be C...

Main Factors to be Considered when Selecting Material The main factors to be considered when selecting a material to meet some specific requirement are: Fitness of use,

Loads analysis, Complete the following problem from the text by Megson.  No...

Complete the following problem from the text by Megson.  Note that since the answers are given, it is essential that you show and justify all work to receive full credit.  Required

Optimization, consider the following LPP max z=9x1+8x2+5x3 subject to 2x1+3...

consider the following LPP max z=9x1+8x2+5x3 subject to 2x1+3x2+x3 5x1+4x2+3x3 x1,x2,x3>_0 (a)solve using simlex method (b)hence using the sesitivity analysis

Determine the radius of curvature - motion of a particle, Determine the rad...

Determine the radius of curvature - motion of a particle: The motion of a particle in XOY plane is defined by the equation r (t ) = 3t i^ + (4t - 3t 2 ) j^ The distanc

Power transmission system of vehicles, (a) Mention the needs to be satisfie...

(a) Mention the needs to be satisfied by power transmission system of vehicles. (b) What is an overdrive? Explain its principle of operation and advantages.

Show that quantity is invariant under lorentz transformation, Q. Show that ...

Q. Show that quantity is invariant under Lorentz transformation. Show that the relativistic kinetic energy is given by C2 and it approaches to non relativistic kinetic energy fo

Kennedy Theorem, the movability of 3 bar mechanism is zero then how can we ...

the movability of 3 bar mechanism is zero then how can we comment on instantaneous centre of it?

Tempering, TEMPERING: The hardening treatment specified to steel rais...

TEMPERING: The hardening treatment specified to steel raises the hardness but initiates internal stresses due to different cooling rates. The internal stresses are created al

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd