company news about Misunderstandings when paying attention to ultrasonic welding

Ultrasonic welding machines are required for the material to be welded, not all materials can be welded. Some people understand that any material can be welded, which is a big misunderstanding. Some kinds of materials can be better welded, some are basically able to fuse, and some are not melted. The melting point between the same material is the same, and the principle is that it can be welded, but when the melting point of the workpiece to be welded is greater than 350 ° C, it is not suitable for ultrasonic welding. Because the ultrasonic is the moment to melt the workpiece molecules, the judgment is based on 3 seconds, and can not be welded well, other welding processes should be selected. Such as hot plate welding. Generally speaking, ABS material is the easiest to weld, and nylon is the most difficult to weld. A considerable number of people engaged in ultrasonic welding for many years have a misunderstanding about the transmission of ultrasonic energy. It is believed that the sound waves are welded on the contact surface. In fact, the true welding principle is: after the transducer converts electrical energy into machinery, it passes through the material molecules of the workpiece. Conduction, the sound resistance of sound waves in solids is much smaller than that in air. When sound waves pass through the joints of workpieces, the sound resistance in the gap is large, and the heat energy generated is quite large. The temperature first reaches the melting point of the workpiece, plus a certain pressure to weld the seam. The other parts of the workpiece are not welded due to low thermal resistance and low temperature. The principle is similar to Ohm's law in electrical engineering.