YAG is an abbreviation of Yttrium Aluminum Garnet. Nd:YAG laser is one of the most widely used lasers, which is produced by optical pumping of YAG crystal doped with Neodymium.
Advantages of YAG laser
| Energy absorption by metal is better than CO2 laser. |
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Process can be done by less energy. |
| Energy can be transferred through optical fiber. |
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Production line can be flexibly designed. |
| YAG rod as the oscillation source does not deteriorate over time. |
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Reliable oscillation can be delivered with less consumables. |
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Laser welding |
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Laser welding is a process of local melt and solidification of various metals by a converged laser beam.
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■ Composition of the laser system
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The laser system is composed of laser oscillator, optical path, beam convergence unit, motion unit, and sealing gas unit.
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■ Fixed optical system and optical fiber
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For laser welding, CO2 laser and YAG laser whose output has been increased are utilized as the oscillator.
Laser beam is generated at the oscillator, and transferred through optical path to beam convergence unit. CO2 laser is transferred by mirror (fixed optical system), and YAG laser is by optical fiber as well as mirror.
The transferred laser light is converged to the proper size by beam convergence unit, composed of parabolic mirror or convergence lens, etc.
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■ Sealing gas (assist gas)
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During the welding process by the converged laser beam, sealing gas (argon, helium, nitrogen) is usually applied in order to prevent oxidation of the weld area. SpeedFam supplies the suitable gas nozzles.
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Laser welding applications |
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Electronics parts, machine parts, or automobile parts are typical laser welding applications. Laser process can be utilized from precise process to thick metal welding.
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■ applications
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- Spot and seam welding of metal parts
- Sealing of hermetic case
- Welding of different materials
- Connection of wire and terminal
- Welding of wires
- Heat consolidation / treatment
- Cut / hole
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