Analysis of Laser Welding Technology Applied in Automobile Manufacturing
2021-05-20144

Laser cleaning is an emerging material surface cleaning treatment technology that can replace traditional pickling, sandblasting and high-pressure water gun cleaning. The laser cleaning machine adopts a portable cleaning head and a fiber laser. It has flexible transmission, good controllability, wide applicable materials, high efficiency and good effect. In recent years, it has been widely used in rail transit, petroleum and petrochemical, automobile molds and other fields.

 

The essence of laser cleaning is the process of using the high energy density of the laser to destroy the contaminants attached to the surface of the substrate without damaging the substrate. According to the analysis of the optical characteristics of the cleaned substrate and the contaminants, the laser cleaning mechanism can be divided into two categories: One is to use the difference in the absorption rate of the contaminant and the substrate to a certain wavelength of laser energy, so that the laser energy can be fully absorbed. The pollutant is absorbed, so that the pollutant is heated to expand or vaporize. The other type is that there is little difference in the absorption rate of the laser from the substrate and the pollutant. The high-frequency, high-power pulsed laser is used to impact the surface of the object, and the shock wave causes the pollutant to burst and separate from the surface of the substrate.

 

Rust removal, paint removal, oil removal and oxide removal of metal surfaces are currently the most widely used areas of laser cleaning. Floating rust removal requires the lowest laser power density, which can be achieved by using ultra-high-energy pulsed lasers or even continuous lasers with poor beam quality. The removal of the dense oxide layer generally requires the use of a near-single-mode MOPA laser with a higher power density and a pulse energy of about 1.5 mJ. For other pollutants, the appropriate light source should be selected according to its light absorption characteristics and the ease of cleaning. Guangzhi Technology's GM-H series and GM-L series products are suitable for the application of super large energy coarse light spot and large energy fine light spot respectively.

 

Metal Rust Removal and Cleaning

 

In addition to metal material cleaning, the customized light source developed by Guangzhi Technology can be applied to special cleaning fields such as glass cleaning. Using conventional MOPA pulsed lasers for glass cleaning can easily cause glass to overheat and burst. Guangzhi Technology’s customized light source adopts a special pulse design and ultra-high peak power, which can efficiently remove paint stains on the glass surface without damaging the glass substrate. This type of light source is also suitable for cleaning fine molds such as printing cylinders, ensuring deep cleaning without damaging the substrate.

Glass Surface Paint Cleaning

 

Laser cleaning can be installed and used in the form of a machine or a robotic arm, and is generally suitable for cleaning production line equipment or large components. In addition, laser cleaning usually uses portable hand-held cleaning heads, which can handle special-shaped workpieces more flexibly. In order to ensure heat dissipation, the isolation head of the conventional high-power MOPA pulsed laser has a large volume, resulting in a large size of the cleaning head, which increases the burden on the operator. For this reason, Guangzhi Technology has developed a series of compact and compact GMC cleaning special models, separating the isolation head and the collimating output head, and adopting a more compact and small QCS output head, making the matched laser cleaning head extremely light and handy.