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
An ideal gas is heated at fixed volume until its temperature is 3 times the original temperature. It is then expanded isothermally till it reaches original pressure. The gas is t


Example of Manufacturing Lead Time (MLT) A certain part is generated in a batch size of 100 units. The batch should be routed through five operations to complete the processin

General Resource Models In  computer  controlled scheduling,    material,  machine handling  equipment,  tooling  and  buffer  space  should  be comprised. The explicit consid

Problem You are playing tetherball because you are seven years old and you have nothing better to do.  If the tetherball has a mass of 1 kg and the rope is 1.5 m long and can w

how did the formula derived smax = Ed1 a ?T/d 2

Dear Sir I would to know what is the min. time required for carbon steel tube A214 @ zero C to 50 C

Consider the U-shaped curved beam shown below (with rectangular cross-section and thickness h ), which is loaded by force P as indicated. A free-body diagram reveals that a mome


Horizontal Curves - Railways In railway engineering, the horizontal curve is defined by its degree as well as by its radius. The degree is the angle subtended at the centre