Follow us
Home > News > Content
Laser Cleaning Technology
Aug 24, 2018

To put it simply, it is to use the high-frequency vibration generated by a certain wavelength of laser to shatter the attachment on the surface of the object; the instantaneous high temperature generated by the laser causes the attached material to peel off the surface of the substrate, thereby achieving the purpose of cleaning.

Laser cleaning objects include contaminated layers, paint layers, rust layers, and adhesion layers on the surface of any material. Its applications include: mold cleaning, metal surface paint layer and solder joint removal, oxides, oil stain removal, restoration and preservation of historical artifacts.

Laser cleaning machine rust removal 200w 500w

Laser cleaning achieves the removal by overcoming the bonding of the substrate material to the surface attachments. The main mechanism of action includes the following aspects:

1. Removal of liquid splash: the subsurface of the attached material does not reach the gasification temperature and exists instantaneously in the form of a thin layer of liquid, while the reaction force generated by the instantaneous expansion of the surface gas and the blowing force of the process gas force the liquid deposit to splash. To achieve the removal effect;

2, the removal of liquid splash: the subsurface of the attached material does not reach the gasification temperature and exists in the form of a thin layer of liquid, while the reaction force generated by the instantaneous expansion of the surface gas and the blowing force of the process gas force the liquid deposit to splash To achieve the removal effect;

3. Removal of vaporization evaporation: laser energy causes vaporization or evaporation of deposits on the substrate;

4. Removal of plasma: The instantaneous high temperature generated by the high energy density laser generates a high temperature gas between the deposit and the substrate material. The gas continues to absorb the laser energy to form a high temperature plasma, and the plasma absorbs the energy and instantly expands to generate an explosion. The shock wave generated by the explosion crushes the adhesion layer;

5. Removal of plasma: The instantaneous high temperature generated by the high energy density laser generates a high temperature gas between the deposit and the substrate material. The gas continues to absorb the laser energy to form a high temperature plasma, and the plasma absorbs the energy and instantly expands to generate an explosion. The shock wave generated by the explosion crushes the adhesion layer;

6. Removal of soft ablation: Laser soft ablation is defined as the phenomenon of mass migration, erosion or loss of material surface due to various mechanisms under the irradiation of low power density laser. Soft ablation often occurs in laser cleaning of organic adhesion layers, and its action is mainly chemical reaction.

Laser cleaning machine rust removal 200w 500w

The pulsed Nd:YAG laser cleaning process relies on the characteristics of the light pulses produced by the laser, based on photophysical reactions caused by the interaction between high intensity beams, short pulsed lasers, and contaminated layers. Its physical principles can be summarized as follows:

1. The absorption of large energy forms a rapidly expanding plasma (a highly ionized unstable gas) that generates a shock wave;

2. The shock wave causes the contaminants to become fragments and is rejected;

3, the light pulse width must be short enough to avoid the heat accumulation of the damaged surface of the treated surface;

4. Experiments have shown that when there is an oxide on the surface of the metal, the plasma is generated on the metal surface.

5. Experiments have shown that when there is an oxide on the surface of the metal, the plasma is generated on the metal surface.

The plasma is generated only when the energy density is above a threshold, which depends on the contaminated or oxide layer being removed. This threshold effect is important for effective cleaning while ensuring the safety of the substrate material. There is also a second threshold for the presence of plasma. If the energy density exceeds this threshold, the substrate material will be destroyed. In order to ensure effective cleaning under the premise of ensuring the safety of the substrate material, the laser parameters must be adjusted according to the situation so that the energy density of the light pulse is strictly between two thresholds.

Laser cleaning machine rust removal 200w 500w