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Comparison Analysis of Various Lasers in Laser Welding

When selecting the laser welding light source, we must fully consider the welding material, joint geometry, speed and other factors. With the wide application of Laser welding machine in the manufacturing industry, how to choose the laser source correctly is a practical problem that manufacturers need to face.

Currently available laser sources on the market are fiber optics, pulsed Nd:YAG, diodes, discs, and CO2 laser sources (CW Nd:YAG laser sources have basically been replaced by fiber optics and disc lasers, so this article does not address it). . The choice of laser source must take full account of various factors such as welding materials, joint geometry, welding speed, form and position tolerances, system integration requirements, etc. Of course, the budget must also be considered. Each laser source has its own characteristics and can meet different welding requirements. Of course, it can be replaced in some cases.

CO2 Laser CO2 gas laser, with a wavelength of 10604nm and a power of 1 to 20 kilowatts, is a very mature laser, and it has been the most important laser source for high-power processing since the last 80 years.

 Fiber laser welding machine laser This highly efficient diode pump laser is actually a small core silicon-based fiber. The laser source appears in the fiber, so no corrections are required, and when the small-core fiber is mapped onto the focusing mirror, the focal spot size can be as small as 10 microns. This compact laser usually comes in two configurations: a single mode of low power welding (less than 300W); and multiple modes for high power welding.

The increase in the power of diode-laser single-light-emitting devices, the emergence of new cooling channel technologies, and the development of micro-optical device technologies that can focus light beams to fibers smaller than 1000 micrometers in diameter have both promoted the emergence of diodes as welding lasers.

 Disc-type laser Flat Yd:YAG crystal thin disc placed in the center of the CW laser - disc laser This design is to avoid the inherent problems of rod laser, using a 0.01in thick disc, the other side with a cooling device support. Cooling with this design allows the laser power to reach 10 kW while ensuring beam quality.

Pulsed Nd:YAG laser This laser uses a single Nd:YAG laser rod to generate the high peak and low average power used for the welding by the flash lamp. For example, a relatively low power, 35W average power can produce high peak power of 6kW. This combination of high peak power and narrow pulse width not only ensures the quality of the material welding, but also provides effective control of energy input.

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