Requirements Of Ultrasonic Welding On Welding Materials

The principle of ultrasonic welding is simply that the ultrasonic machine sends out the set frequency to make the two bonded materials produce the maximum amplitude. When the frequency sent out is consistent with the natural frequency of the material, the amplitude is the largest. This amplitude drives the molecules (or molecular chains) inside the material to vibrate more accurately, resulting in instantaneous high temperature, which causes the two materials to be bonded together during the cooling process.

Due to the current technical level, most of the materials commonly used for ultrasonic welding are polymer materials, such as PMMA, ABS PC, etc. I believe that with the development of science and technology, I personally feel that all materials can be welded by ultrasonic wave

1. It is necessary to understand the weldability of materials to be welded. Some materials are difficult to weld, while others are not. Plastics are divided into thermosetting and thermoplastic materials. Thermosetting materials shall not be welded. Thermoplastic materials are divided into amorphous materials (such as ABS) and semi crystalline materials (such as PET / PBT). Amorphous materials are easy to be welded by ultrasonic waves, while semi crystalline materials are difficult to be welded. Please refer to the chart provided.

2. Pay attention to the pre-treatment process of welded plastic parts. Some materials may have additives during injection molding, such as glass fiber, talc powder, etc. And pay attention to whether the moisture content of the material is enough to be dried, etc... specific problems are treated specifically.

3. Shape of welding part: generally, there are standard designs, such as basic energy director and shear joint. Generally, the basic type is divided into ladder type design and tenon groove type design. Shenzhen jiayuanda company can provide you with professional consulting and services.