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An YAG laser is a laser in which the active gain medium is neodymium-doped yttrium aluminum garnet (Nd:YAG). Nd:YAG lasers are optically pumped using either a flashlamp or laser diode array. They are one of the most common solid-state laser types and are used in a wide range of industrial applications. Capable of conduction, conduction/penetration, and keyhole weld modes, Nd:YAG laser welders join steels, nickel alloys, titanium, aluminum, and copper in applications such as automotive components and squib wire assemblies.
Nd:YAG lasers typically emit light at a wavelength of 1064 nm, and can be frequency doubled to 532 nm (green) for specific applications.
Nd:YAG laser welding systems use this focused laser energy to join materials with precision and controlled heat input.
Laser welding is a non-contact process that requires access to the weld zone from only one side of the parts being joined. The weld is formed as intense laser light rapidly heats the material, typically within milliseconds, creating localized fusion at the joint.
Because energy delivery is highly controlled and concentrated, Nd:YAG laser welding enables precise weld formation with minimal overall heat input to the surrounding material.
Nd:YAG laser welders can achieve three primary weld modes:
The selected weld mode depends on material type, joint design, and application requirements.
Because laser welding is non-contact, a wide range of joint geometries can be welded. The most significant requirement for successful laser welding is close fit-up at the joint interface.
Nd:YAG laser welders can join:
As with other joining technologies, certain materials may present challenges depending on:
Nd:YAG laser welding is used in applications requiring precision joining and controlled energy delivery, including:
These applications benefit from the ability to produce consistent welds with rapid energy input and localized heating.
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