In the process of automobile manufacturing, the drawing lubricant or cooling lubricant and antirust oil used will pollute the automobile components and seriously reduce the quality of the subsequent high-energy bonding or bonding process. The welds and bonding in the powertrain assembly must meet strict quality standards. Therefore, the mating surface must be thoroughly cleaned. Traditional cleaning methods are time-consuming, unable to achieve automation, and usually have harmful effects on the environment.

The laser cleaning is fast and automatic, which can thoroughly clean the surface residue, so as to obtain strong, no gap and micro crack welding and bonding. In addition, laser cleaning is very soft and the process speed is obviously faster than other methods. These advantages have been recognized by the automotive industry.

In the industrial field, in order to protect metal or other base materials, the surface is usually painted to achieve the functions of rust prevention, oxidation prevention and corrosion prevention. When the paint layer falls off partially or the surface needs to be repainted for other reasons, the original paint layer needs to be completely cleaned. In the automotive industry, it is necessary to remove the old paint on the surface in order to spray new paint before the body overhaul.

There are many traditional vehicle body paint cleaning methods, mainly mechanical and chemical methods, including high-pressure water jet paint removal, sand blasting and steel brush polishing, and chemical methods mainly refer to chemical reagent paint removal. These methods have defects such as high cost, high energy consumption, easy pollution and easy damage to the substrate surface, and have gradually failed to meet the high requirements of modern cleaning methods for environmental protection. In view of this situation, many new cleaning technologies emerge as the times require, and laser cleaning, as one of the important means, gradually shows its advantages. Selective removal, no substrate damage and rapid cleaning rate are the key favorable factors for laser cleaning paint.