Laser Transmisson Welding (LTW)
Laser Transmission Welding of Plastics
Laser transmission welding is a well-established process for joining plastic components with high precision and reliability. It is based on the principle of transmitting laser energy through a transparent joining partner and selectively absorbing it in the underlying material, generating localized heat and creating a strong, clean weld.
The process is particularly suitable for applications requiring high optical quality, tight seams, and minimal thermal impact. It enables particle-free, non-contact joining and is widely used in industries such as automotive, medical, and consumer products.
Depending on component geometry, material combination, and production requirements, different process variants can be applied. These include mask welding, contour welding, radial welding, quasi-simultaneous welding, advanced quasi-simultaneous welding, and simultaneous welding.
Each method offers specific advantages in terms of cycle time, flexibility, and weld quality. This allows manufacturers to select the optimal process for their application, ensuring efficient production and consistent, reproducible results.
Process Variants
Laser transmission welding can be performed using different laser sources, such as diode lasers at 1 µm, fiber lasers at 2 µm, or other wavelengths depending on the application requirements. The process typically follows the contour of the joining geometry, with a single laser beam guided along the weld path.
Relative movement between the laser beam and the joining parts can be realized via axis systems, robots, or radial welding units, allowing high flexibility in production. Process control is commonly achieved through temperature monitoring to ensure consistent weld quality. Depending on the material combination, both transparent-to-absorbing and transparent-to-transparent joining configurations can be implemented.
Laser transmission welding can be performed using various laser sources, including diode lasers at 1 µm, fiber lasers at 2 µm, and other wavelengths depending on the specific application. The process involves relative movement between the laser beam and the joining parts, which can be realized through rotation using axis systems, robots, or radial welding units.
Process control is typically achieved via temperature monitoring to ensure stable and consistent weld quality. Depending on the materials used, both transparent-to-absorbing and transparent-to-transparent joining configurations can be implemented.
Laser transmission welding can be carried out using diode lasers at 1 µm as well as other wavelengths, depending on the application. The welding profile is defined either by guiding a single laser beam along the welding area or by using a mask to shape the weld geometry.
The laser beam is controlled by a galvanometric scanner, enabling fast and precise positioning. Process control is achieved through temperature monitoring and additional systems such as EvoInspect Vision to ensure consistent weld quality. The process is typically used for transparent-to-absorbing material combinations.
Laser transmission welding can be performed using diode lasers at 1 µm as well as other wavelengths, depending on the application requirements. The welding process follows the contour multiple times, allowing precise and controlled energy input along the joint.
The laser beam is guided by a galvanometric scanner, enabling high-speed and accurate positioning. Process control is achieved through systems such as Standard Collapse Control (SCC) and Advanced Collapse Control (ACC), ensuring consistent weld quality. The process is typically used for transparent-to-absorbing material combinations.
Laser transmission welding can be performed using a combination of two different wavelengths, such as 1 µm and 2 µm, enabling optimized energy input for a wider range of material combinations. The welding process follows the contour multiple times, ensuring uniform heat distribution and precise joining results.
The laser beam is guided by a galvanometric scanner for fast and accurate positioning. Process control is achieved through Standard Collapse Control (SCC) and Advanced Collapse Control (ACC), ensuring consistent weld quality. Depending on the application, both transparent-to-absorbing and transparent-to-transparent material combinations can be processed.
Laser transmission welding can be performed using diode lasers at 1 µm, fiber lasers at 2 µm, or other wavelengths depending on the application. The laser beam profile is shaped according to the welding path, allowing precise and uniform energy distribution across the entire joint.
As no relative movement between the laser and the joining parts is required, the process enables simultaneous welding with high efficiency. Process control is ensured through Standard Collapse Control (SCC) and Advanced Collapse Control (ACC), providing consistent weld quality. The method is suitable for both transparent-to-absorbing and transparent-to-transparent material combinations.
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