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Views: 63 Author: Site Editor Publish Time: 01-10-2022 Origin: Site
With the development and progress of laser technology, laser welding between dissimilar materials has gradually increased. For example, a highly reliable "welding" between metal and plastic can be carried out by laser. Below, Leapion Laser shares the laser welding machine technology used between metal and plastic.
1. In the automobile processing industry, with the advent of lightweight automobiles, metal and plastic connections are in wide demand. Because metal materials have many excellent properties such as high plasticity, high thermal conductivity, and easy processing, they are indispensable in the connection of different materials. At the same time, plastic has the advantages of corrosion resistance, light weight, and heat insulation.
2. In order to meet the assembly line requirements of the automotive industry. The connection process must be fast, reliable and automated. However, due to the different properties of the two materials, it is difficult to achieve a good connection between metal and plastic in the process of producing parts.
3. The most traditional techniques for welding plastic and metal materials are: adhesive bonding, mechanical welding, overmolding, or a combination of these processes. These methods involve a large number of assembly operations and can cause design problems. limit.
1. The laser directly connects metal and plastic. First, metal surface treatment is required. The laser is scanned in this area to locally corrode the material and form a grooved microstructure on the metal surface.
The groove can be as small as a few microns wide, and the depth can be changed by scanning the laser multiple times in the same area. After processing a deep groove on the metal surface with a high-frequency pulse laser, the metal and plastic are pressed together with a tool, and the plastic of the joint is heated and melted with a continuous laser to form an effective connection.
2. The second step: overlap the plastic and the structured metal and heat it to the melting temperature.
For plastics with transparent laser wavelengths, the laser beam can be applied from the side of the plastic-the laser energy is transmitted through the plastic to the bonding interface, where the energy is absorbed by the metal. The metal gradually heats up, and the low thermal conductivity of the plastic ensures a local hot spot, which melts the plastic.
3. Through the test, all kinds of thermoplastics can be connected with stainless steel, aluminum alloy, copper alloy, etc. After welding, the tensile test weld does not fall off, and the welding strength can be higher than the strength of the plastic base material.
Nowadays, in more and more industrial applications, lasers have been regarded as an alternative solution for directly welding plastic/composite materials to metal. Laser welding technology is also increasingly used in various fields.
For other information and content inquiries about laser welding machines, please pay attention to Leapion Laser.
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