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A fiber laser (fibre laser) is generated within a flexible doped glass fiber that is typically 10 to 30 feet long and between 10 and 50 microns diameter. The doping element is typically Ytterbium (Yb). AMADA WELD TECH offers a full line of Fiber Laser Welders with average power from 250 W to 1 kW.
Fiber laser welders are efficient and low-maintenance; no need to align the medium to cavity mirrors, nor maintain optics or alignment. Fiber lasers are so efficient that they can be small, air-cooled, and provide high wall plug efficiencies. Fiber lasers welders also offer fine focus and a range of beam qualities, which can be tuned for each welding application.
Laser welding is a process which requires access to the weld zone from only one side of the parts being welded. The laser weld is formed as the intense laser light rapidly heats the material – typically calculated in milliseconds.
Three types of welds can be achieved with laser welders: conduction, conduction/penetration and penetration or ‘keyhole.’ Conduction welds are performed at low energy, resulting in wide, shallow weld nuggets. Conduction/penetration welds utilize a medium energy density and result in a deeper weld nugget. Penetration or keyhole welds are resultant of direct energy delivery into the material being welded resulting in deep, narrow nuggets.
As laser welding is a non-contact process, there are a great number of joint geometries that can be welded. The most significant requirement is that there be a close fit-up at the joint interfaces. Laser welders can join a wide range of steels, nickel alloys, titanium, aluminum, and copper. As with other joining technologies, some materials are difficult to laser weld unless they meet specific characteristics, namely, reflectivity, the effect of high thermal cycling, and the vaporization of volatile alloying elements.
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