Types of lasers for laser welding

Laser beams can be extracted by using a gas, solid, or liquid as a medium. Of these methods, welding lasers use a gas or solid as the medium. Therefore, the types of lasers used for laser welding can be generally divided into gas lasers or solid-state lasers.

Gas laser welding uses carbon dioxide (CO2) or other gases to produce light.
Solid-state laser welding uses ores such as yttrium, aluminum, and garnet (as with YAG laser welding) to produce light.

Recently, fiber laser welding using optical fibers for oscillation, as well as semiconductor lasers and disk lasers developed from YAG lasers have increased in popularity.

Lasers used for laser welding
Wavelength Oscillation form
Gas CO2 laser
  • 10.6 μm
  • CW
  • Pulse
TEA-CO2
  • Varies by gas pressure
  • Pulse
Solid-state YAG laser
  • 10.6 μm
  • CW
  • Pulse
YVO4
  • 10.6 μm
  • Pulse
Fiber Yb fiber
  • 975 nm
  • CW
  • Q-switch
  • Ultra-short pulse
Semiconductor LD (laser diode) laser
  • 1070 nm
  • CW
  • Pulse

CW: Continuous wave operation
Pulse: Pulse oscillation

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