Technology laser welding

Laser welding technology

High quality and precision plastic joinings with Panasonic’s laser welding method

The new laser welding system of the VL-W1 series is based on the technology of quasi-simultaneous welding. With this method, plastic layers can be welded together by laser emission and heat build-up at the adjacent surfaces without the need for adhesives. One of the characteristics of the quasi-simultaneous welding is that the laser beam is directed very fast (quasi-simultaneously) around the component to be welded. Main advantage: the component is joined together regularly so that no warping occurs. Furthermore, using the laser guarantees a high flexibility of the welding seam geometry.

Weldable plastic materials

Which plastic materials can be welded by the Panasonic VL-W1? The materials may consist of elastomers, semi-crystalline, and amorphous plastics. Basically, the component should consist of one transparent and one absorbing material. The laser beam passes through the laser transparent (upper) material and then is absorbed by the laser absorbing (lower) material. The laser-absorbing material heats up and melts together with the laser-transparent material by heat transmission. During welding, a joining pressure adapted to the needs of the workpiece supports a precise junction of the plastic components.

Plastic components laser welding

Level of difficulty of the material combinations

Applications with black joining parts combined with transparent, black or colored plastics are standard applications. Pure colored, transparent, and white materials increase the level of difficulty during overlap welding. For welding colored plastics, the necessary combinations of colorants in laser transparent and laser absorbing form are developed at the request of the customers. This is a typical task for the experienced masterbatch manufacturer – we have partners with long years of experience. Due to its scattering properties and its low transparency, “white on white” represents the highest level of difficulty, but also in this case individual solutions are possible.
Please send us your samples with color and material combination. We will develop your sample solution.

Panasonic Laser welding material combinations

Constant testing of material components

Materials like PP or PET and many others listed in our database extract have been tested from Panasonic in detail for weldability. Our European central laboratory is always checking out new material compositions and testing them thoroughly. We would be happy to test also your materials.

Panasonic’s laser welding tested material combinations

Highest laser beam quality

Thanks to the unique oscillation principle of the Panasonic fiber laser, the fiber can be used as an amplification medium. Since light can be amplified inside an extremely thin fiber core, a laser light with a high beam quality can be obtained. Thus, less energy is required and a stable beam from the first processing step till the end of production is guaranteed.
The picture illustrates the difference of light intensity distribution between the laser diode light and the fiber laser.

Panasonic’s laser welding quality

Spiral function

Thanks to this function, the welding seam can be fit to the contour of the component.

For detailed information please see our Panasonic Laser Welding System for plastic applications.

Panasonic’s spiral function

Panasonic’s beam design

With the exact and parallel light of the VL-W1, component weldings on complex surfaces can be realized. Thus, processing with a height difference of +/- 15 mm is possible. 3D component geometries can be welded flawlessly.

For detailed information please see our Panasonic Laser Welding System for plastic applications.

Panasonic 3D laser welding