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Laser welding technology in the field of lights
Publisher: suzhou kailinneng automation equipment co., LTD Release time：2023-03-23 15:10:56 Click on the number of times：67 Shut down
With the rapid development of the automobile industry. The production technology of automobile spare parts also innovates continuously. As an important lighting external assembly, automobile headlights affect the commercial property of automobiles in terms of function and appearance. In order to comply with the consumer's pursuit of quality and beauty, laser welding technology is gradually widely used in the field of car lights. However, at the same time of the introduction of new technology and complex process, there will be a corresponding impact on the product quality of the potential hidden trouble, resulting in poor lamp function and even the possibility of traffic accidents, this paper combined with the idea of FMEA (design potential failure mode), provides several analysis methods to ensure product quality in the design stage. And the common methods of quality management after trial and quantity.
In recent years, with the expansion of the global automobile market demand, while the process of automobile intelligence is accelerating, the advanced manufacturing technology represented by laser technology is also constantly promoting the renewal of the automobile manufacturing industry, and the combination of advanced laser manufacturing technology and automobile production has been the general trend. The laser welding technology was first introduced into China in October 2002, and quickly emerged in the field of body welding, while its application in the field of headlights is also developing rapidly.

1. Summary of laser welding technology in the field of car lights
1.1 Principles
The object of laser welding in the field of car lights is resin, and other principles are the same as body welding. It is to weld two or more resin parts through the heat generated by the laser to melt the resin parts and completely bonded technology, in order to achieve good sealing of the lamp.
The steps are divided into: (1) the two parts to be welded are fixed through the fixture fixture. (2) The upper and lower fixture is closed, the parts are squeezed together, and then near infrared laser NIR (wavelength 810-1064nm) is transmitted through the first part, and then absorbed by the second part. The absorbed near infrared laser is converted into heat energy, melting the contact surface of the two parts and forming a welding area. (3) Apply pressure to make the welding area firm.
1.2 Features
Advantages: (1) Energy concentration, minimal excess energy consumption. (2) The volume of the melted resin is small, and the excess resin chips are less. (3) Because it does not belong to the contact welding process, the loss and deformation of the machine can be minimized. (4) The laser path can be controlled by simple optical refraction principle, so it is suitable for various shapes of products. (5) The laser beam can be focused on a very small area and can be welded to small and closely spaced parts. (6) can weld a wide range of materials, can also be bonded with a variety of heterogeneous materials. (7) Easy to automate high-speed welding, can also be digital or computer control. (8) The laser source can be shared on multiple devices by switching devices.
Disadvantages: (1) The position of the solder must be very precise, and must be within the focusing range of the laser beam. (2) When welds need to use clamp, it must be ensured that the final position of the welds is within the tolerance range. (3) The color of the resin material will affect the weldability. (4) Expensive equipment.
It can be seen that laser welding has advantages in appearance, energy saving, environmental protection and wide application range on the premise of meeting the sealing property of headlights. However, due to the high precision, the corresponding products and clamp need to have strict dimensional tolerance requirements.