Laser welding is the use of stimulated emission of laser as a heat source, the data heating, melting, cooling, to achieve the process of bonding between atoms. Laser welding can be divided into laser self welding and laser composite welding according to the filling data, and can be divided into general laser welding and laser scanning welding according to the structure of the galvanometer; according to the welding depth, the laser welding can be divided into laser heat conduction welding and laser deep penetration welding.
Laser welding, as a high quality, high precision, low deformation, high power and high speed welding method, has been paid more and more attention. The application is used for pulse solid laser spot welding of small parts, and from the point of a solder joint lap seam welding. High power CO2 laser is similar to electron beam welding, and the deep penetration welding based on keyhole effect makes the laser deep penetration welding technology develop rapidly and widely used in industrial machinery.
With high power YAG laser breaking the average power of 1Kw, and can be continuous or high repetition frequency output, but also can complete deep penetration welding. Its wavelength is relatively short, the metal absorption rate is high, the welding process is rarely subject to light induced plasma disturbance, and has a good application prospect.
Along with the development of fiber laser, high power fiber laser is fabricated, fiber laser beam quality, long life and equipment from long term of protection, storage and power is higher than CO2 laser wavelength, but only 1/10 of its power, electro-optical conversion reached 30%, to promote the use of laser welding. The category of laser welding has now reached from aerospace, ordnance, ship making, automobile manufacture, pressure vessel production, exhibition and medical and other fields.