Laser processes - Laser Transmission Welding

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Laser transmission welding is a process for joining 2 materials with a hidden weld where one material is transparent to the laser and the other absorbs the laser energy. Laser-transmission welding is feasible when two materials that respond quite differently to laser light are used in joining (see picture at left). The method uses near-infrared (NIR) light at wavelengths around 810 to 1064 nm. It passes through one (NIR-transmitting) part and is then absorbed by a second (NIR-absorbing) part while the two parts are clamped together at low pressure. The absorbing material converts NIR to heat and melts at the part interface, while heat is also conducted back into the mating surface of the light-transmitting part to create a welding zone. Joint strength can exceed that of the original materials.

Laser welding or laser bonding can be used in a production environment to produce highly accurate welds quickly and repeatably.