Essay On Laser Welding

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Laser commonly Known as Light Amplification by Stimulated Emission of Radiation. Laser is a phenomena in which a very narrow or thin beam of intense electromagnetic radiation i.e. light is emitted.
Laser Beam Welding (LBW) is a welding technique or method used to join or link up pieces of metal with the help of a laser technology. The beam provides a concentrated/focused heat(infrared) source, allowing for narrow, deep, precise welds and high welding accuracy. The process is frequently/often used on large scale , such as in the automotive industry to make automotive bodies lighter with a stronger joints.

Same as Electron Beam Welding (EBW), laser beam welding also has a high power source of order of 1 MW/cm2 which results in small/concentrated heat-altered zones and high heating and cooling rates. The spot size or the focused area of the laser varies between 0.2 mm to 13 mm, due to smaller focus spot its makes the welding laser accurately and precisely. The depth of penetration is proportional to the amount of power supplied but it is also dependent on the location of the focus point. The penetration is maximized when the focus point is slightly below the surface of the work piece.
A continuous or pulsed laser beam may be used depending upon the application. Millisecond-long pulses are used to weld thin materials such as razor blades while continuous laser systems are used for deeper welds.
Laser Beam Welding is a multipurpose process which is capable of welding carbon steels, HSLA steels, stainless steel, aluminum, and titanium. Due to its high cooling rates the cracking is a matter of concern when welding high-carbon steels. The weld quality is high and similar to that of electron beam welding. The speed of weld...

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...rely which means the exhaustion strength of the welded joint will be excellent.
 Energy distribution across the beam is generated by the design of the resonant cavity, including mirror curvatures or shape and their relative arrangement. This combination results in photon oscillation within the cavity specific output beam energy patterns, these patterns are called Transverse Energy Modes (TEMs).
 The function of all Laser Beam Welding processes whether they be gas (carbon dioxide, helium, neon, etc.) or other lasering sources is based on the principles of the excitation of atoms using intense light, electricity, electron beams, chemicals, etc., and the spontaneous and stimulated release of photons.
 The role of focusing lenses in this process is really important because it concentrates the beam energy into a focus spot as small as 0.005 in diameters or even less.
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