The ultrasonic gluing is similar to ultrasonic welding. The significant difference is the material that is used for the joining of both fabrics.
During ultrasonic welding process the fabric itself is heated and pressed and joined together. That is only possible with synthetics which are weldable.
During the ultrasonic gluing process an adhesive tape is guided between the fabric.
By means of ultrasonic the hot-melt tape is heated, becomes liquid and bonds the two fabric lengths. This application is call ultrasonic bonding or ultrasonic gluing.
By a patented cooling and pressing device the strength of the seam gets increased.
Advantages are that you can also bond non-thermoplastic fabrics, you do not need as much energy as for the welding process, the joined seams are considerably stronger than sewn seams, they are waterproof and almost invisible and the optic and structure of the fabric is not damaged.
The use of fiberglass enforced adhesive tapes provide additional strength and avoid overstretching of the awning cover. Less typical wrinkling and a longer endurance are the result.
More information you will find in Textile Solar Protection.