Laser beam welding, Mechanical Engineering

LASER BEAM WELDING


In this process, fusion is achieved by directing a highly concentrated beam to a fine spot. The word LASER  is an abbreviation of Light Amplification by Stimulated Emission of Radiation. High energy output is available from CO2 Laser and Nd-YAG Lasers. In CO2 Lasers, CO2 is the lasing medium. A high voltage of the order of 20 to 30 KV is applied through a pair of electrodes. This high voltage excites the gas particles. When a fundamental particle of light such as
photon hits the excited gas CO2 gas atom, the excited CO2 gas atom returns to normalcy. But, in the process it emits another photon with same direction, amplitude and frequency. This achieves the light amplification by stimulated emission of radiation.

The emitted photons travelling in the same direction, hits the mirror in one direction, reflected back & hits the mirror in the opposite direction. Within a short time, a narrow, coherent beam of laser light is formed, a part of which comes out through the partially transparent output mirror. This beam is further focused to achieve the welding or cutting, etc. Depending on the lasing medium, we have solid, liquid, gas and semiconductor lasers. CO2  Laser is the most popular gas laser and Nd-YAG is the most popular solid laser used for industrial applications. Laser beam can be used to weld otherwise difficult to weld metals such as nickel, tungsten steel, titanium and columbium. This can also be used for cutting hula rubber, plastic, paper, cloth, etc. Lasers are used in medical, electronic,  automobile, sheet metal
works, aerospace, defence, communication and fabrication industries.

Posted Date: 9/13/2012 7:06:16 AM | Location : United States







Related Discussions:- Laser beam welding, Assignment Help, Ask Question on Laser beam welding, Get Answer, Expert's Help, Laser beam welding Discussions

Write discussion on Laser beam welding
Your posts are moderated
Related Questions
m=4.9Kg, K=3694 N/m, x=0.013m. I have this much details, now I want to find the damping constant ''b''. I hv tried so much, but this question needs damping ratio ''zeta'' or damped

How do i calculate the flame radius and flame speed if unstretched flame speed=2.8m/sec and markstein length=5 mm. ?

how the car manufacturing company handle the material

Transverse Electric Field Consider a charged particle (e.g. an electron) moving along  X-axis  with constant velocity  v ,  i . At  x = 0 , it enters into a region where a unif

See the Petri net represent in following figures (a) and (b) as represented in the figure for analysis and depiction of qualitative pathological behaviors. Figure: (a): An

Type of Lubrication Systems The complete lubrication of a vehicle can be divided into two systems. (a) Engine lubrication system. (b) Chassis lubrication system.

Define O.R. and what are the applications in Industry ? A firm uses lathe, milling and Grinding machine to make two machine parts. The table below show the machining time requir

Seam Welding-Selection of parameters The selection of parameters for seam welding depends mainly on: weld nugget size which is related to weld strength. probability of

Numerica l Problems Based on Overhanging Beam: Q: Draw Shear force diagram for the simply supported beam loaded as shown in the figure given below. Sol.: Let the

Question: As shown in the figure, the jet transport B is flying north with a velocity v B = 600 km/h when a smaller aircraft A passes underneath the transport headed in the 60