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This guide includes basic welding knowledge such as welding types and mechanisms, and detailed knowledge related to welding automation and troubleshooting.

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A solid-state laser uses ore such as yttrium, aluminum, and garnet (YAG) or yttrium vanadate crystal (YVO4) as the laser medium. Because solid-state lasers have a large laser output per unit volume, a large laser output is possible even with a small resonator.

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Lasers used for laser welding employ gas, a solid object, or a semiconductor as the medium. The oscillation form, output, and conversion efficiency of the laser beam output by each medium vary. The following section takes a closer look at the features of each medium while also explaining the oscillation form, which is a major factor in laser welding.

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The oscillation form of a laser can be either pulsed or continuous. Pulse oscillation lasers generate a pulse wave by controlling (through light modulation) the intensity, wavelength, and phase of the laser beam. Methods for generating a pulse also include controlling the Q value of the laser oscillator as with Q-switch lasers. The “Q value” is the ratio of energy consumed in each cycle to the accumulated energy. This value can be expressed by the following formula.

A gas laser uses a gas such as CO2 as the laser medium. Compared with solid-state lasers or other laser mediums, a gas medium is more uniform with less loss, and the resonator can be larger to allow for larger laser output.

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Semiconductor lasers use III-V semiconductors or IV-VI semiconductors for the laser medium. Both semiconductor types ensure device compactness while also offering a large laser output. Although semiconductors are solid objects, they are sometimes classified separately from solid-state lasers in laser technology fields.