Welding metals and alloys with fiber laser is bringing more new functions and higher flexibility to this field, which makes many leading manufacturers pay more attention to it, especially in the aerospace field. These research and progress are mainly to develop processes and systems related to fiber laser welding 2D and 3D parts, including low, medium and high-power CW and QCW fiber lasers.
Applications in metals and alloys have been proven, such as 304 stainless steel, titanium alloys (Ti-6Al-4V titanium alloy and ti-6al-2sn-4zr-6mo titanium alloy) and nickel based high temperature resistant alloys, including Inconel 625, Inconel 718 and Hastelloy X. With its kilowatt average power, 1 μ M wavelength and high brightness (beam quality), high-power CW and QCW fiber lasers can provide a laser source with new functions and flexibility.
Compared with CO2 laser welding, 1 μ The advantages of m-wavelength fiber laser include: using optical cable without rotating the mirror, which makes beam conduction easier; More absorbed by metals, especially those with good conductivity, such as aluminum and copper; It is less absorbed by the plasma plume formed on the welding pool. Compared with high-power Nd: YAG laser, the brightness of fiber laser is higher, which means that the laser beam can be focused to a smaller size as required, which will bring higher power density. These factors help to obtain higher power than other laser sources at the same power
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