There is usually a layer of oxide skin and rust on the surface of steel. Oxide skin is the oxide produced by steel contacting with air at high temperature during rolling.The oxide skin is gray black and is applied on the steel surface. Rust layer is a substance containing oxide and water molecules, which is yellow and also exists on the surface of steel. Oxide skin and rust are very harmful to steel.Serious oxide skin and rust can weaken the bearing capacity of structural members. Generally, the thickness of crane beam, column and other structural parts is about 6-10 mm, and the weakening of component section by oxide skin and rust cannot be ignored.The existence of oxide and rust in steel structure will reduce the quality of steel structure painting.If the paint is directly sprayed on the oxide skin or rust, the combination of oxide skin and steel surface is very fragile. For example, the elastic deformation, thermal expansion, cold shrinkage and collision of the stressed components will make the oxide skin and rust fall off, so the paint will also fall off and lose its protective effect.

Traditional cleaning methods are out of date, such as pickling, shot blasting, sandpaper grinding, etc. But these methods not only pollute the environment, but also are inefficient, time-consuming and waste human resources.

The laser cleaning equipment developed and produced by Shanghai runqia company has a good and efficient cleaning effect on high-temperature oxide scale, copper and rust, and uses laser shock wave to make the dirt on its surface evaporate.The use process is smoke-free and tasteless, which is an ideal environmental protection product. It can improve the production efficiency, simplify the production process, and greatly reduce the cost.

Powerful features：

Oil removal, rust removal, multi-function, very simple process operation, 3-5 minutes to learn the whole operation process, and 1 hour to skilled operation, truly simple, fast, low cost, environmental protection.

Principle of laser surface cleaning：

The cleaning process of pulsed Nd: YAG laser depends on the characteristics of the optical pulse generated by the laser, which is based on the photophysical reaction caused by the interaction between high-intensity beam, short pulse laser and pollution layer.Its physical principle can be summarized as follows:

a) The laser beam is absorbed by the pollution layer on the surface to be treated.

b) The absorption of large energy forms a rapidly expanding plasma (highly ionized unstable gas), which produces shock wave.

c) Shock waves fragment and remove pollutants.

d) The optical pulse width must be short enough to avoid the heat accumulation which will damage the treated surface.

e) Experiments show that when there are oxides on the metal surface, the plasma is produced on the metal surface.

The plasma is produced only when the energy density is higher than the threshold value, which depends on the removed pollution layer or oxide layer.This threshold effect is very important for effective cleaning under the condition of ensuring the safety of substrate materials. There is a second threshold for the appearance of plasma.If the energy density exceeds this threshold, the substrate material will be destroyed. In order to ensure the safety of the substrate materials, the laser parameters must be adjusted according to the situation, so that the energy density of the light pulse is strictly between two thresholds.

Advantages of laser cleaning：

1：Only clean the non-contact surface without additional medium with laser.

2：Low production cost and fast investment recovery.

3：No damage to the base material

4：No environmental pollution

5：Precisely controlled processing and high product quality

6：High processing efficiency

7：Low noise

8: It is easy to realize automation and integrate into the existing process and production line without maintenance and repair requirements.

Application fields：

The laser cleaning machine is widely used in the bright cleaning of various stainless steels to remove all kinds of oil, rust, oxide skin, welding spots and other dirt. After treatment, the surface can be restored to the original stainless steel color.

Operation process：

1. Small workpieces can be cleaned automatically. The specific cleaning time is related to the thickness of oxide skin. Please test the specific value in production.

2. Large workpieces can be designed as sliding platform for cleaning.

3. The complex parts of the workpiece can be cleaned by hand-held operation.