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Comparison of pulsed and continuous laser cleaning and paint removal

1. Cleaning the aluminum alloy surface paint layer
5a: Pulsed light: The paint layer on the surface of the sample is completely removed, the surface of the sample is metallic white, and there is almost no damage to the sample substrate.
5b: Continuous light: The paint layer on the surface of the sample is also completely removed, but the surface of the sample is gray-black, and the substrate of the sample is also slightly melted.
2. Clean the surface paint layer of carbon steel
5c: Pulsed light: The paint layer on the surface of the sample is completely removed, the surface of the sample is gray-black, and the damage to the sample matrix is small.
5d: Continuously bright: The paint layer on the surface of the sample is also completely removed, but the surface of the sample is dark black, and it can be intuitively seen that there is a large remelting phenomenon on the surface of the sample.
Therefore, using continuous light is more likely to cause damage to the substrate than using pulsed light.

  • Comparison of cleaning efficiency

1. In terms of paint removal on aluminum alloy surfaces: the paint removal efficiency of pulsed light is 7.7 times that of continuous light.
Pulse light: 2.77m²/h
Continuous light: 0.36m²/h.
2. In terms of paint removal on carbon steel surface, the paint removal efficiency of pulsed light is 3.5 times that of continuous light.
Pulse light: 1.06m²/h
Continuous light: 0.3m²/h.

  • Conclusion

Experiments show that both continuous lasers and pulsed lasers can remove the paint on the surface of the material and achieve the effect of cleaning.
Under the same power conditions, the cleaning efficiency of pulsed laser is much higher than that of continuous laser. At the same time, pulsed laser can better control the heat input to prevent the substrate temperature from being too high or micro-melting.
CW lasers have an advantage in price, and can make up for the gap in efficiency with pulsed lasers by using high-power lasers, but high-power CW lasers have greater heat input and increased damage to the substrate. Therefore, there are fundamental differences between the two in application scenarios.
1. With high precision, it is necessary to strictly control the heating of the substrate, and the application scenarios that require the substrate to be non-destructive, such as molds, should choose a pulsed laser.
2. For some large steel structures, pipes, etc., due to the large volume and fast heat dissipation, the requirements for damage to the substrate are not high, and continuous lasers can be selected.

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