Laser beam welding is a technique in manufacturing whereby two or more pieces of material (usually metal) are joined by together through the use of a laser beam. Laser stands for Light Amplification by Stimulated Emission of Radiation. It is a non-contact process that requires access to the weld zone from one side of the parts being welded.
The weld is formed as the intense laser light rapidly heats the material – typically calculated in Milliseconds.
The laser beam is a coherent (single phase) light of a single wavelength (monochromatic). The laser beam has low beam divergence and high energy content and thus will create heat when it strikes a surface.
Lasers are used for materials that are difficult to weld using other methods, for hard to access areas and for extremely small components. Inert gas shielding is needed for more reactive materials.
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Source: The Weld Guru