1. Process misunderstanding of welding workpieces. Ultrasonic energy bursts instantly. The welding line should be a point or line and the transmission distance must conform to the ultrasonic welding method. Some people think that as long as it is a plastic material, no matter how the joint surface can be welded well, this is a wrong understanding. When the instantaneous energy is generated, the larger the joint area, the more serious the energy dispersion, the worse the welding effect, and even the welding is impossible. Ultrasonic waves propagate longitudinally, and the energy loss is proportional to the distance. The long distance should be controlled within 7.5 cm.
2: Misunderstanding of workpiece material Ultrasonic welding machine has requirements for the material of the workpiece to be welded. Not all materials can be welded. Some people think that any material can be welded. This is a big misunderstanding. Some materials can be welded well. The basic can be welded, and some are not. The melting point of the same material is the same, and it can be welded in principle.
3: Misunderstanding of welding principle. A considerable number of people who have been engaged in ultrasonic welding for many years have a misunderstanding of ultrasonic energy transmission. It is actually a misunderstanding that sound waves are welded on the contact surface. The real welding principle is that the transducer transfers electrical energy. After being converted into mechanical energy, it is conducted through the material molecules of the workpiece. The acoustic resistance of the sound wave in the solid is much smaller than the acoustic resistance in the air. The melting point of the workpiece is reached first, and a certain pressure is added to make the seam welded, and the other parts of the workpiece will not be welded due to the low acoustic resistance and low temperature. The principle is similar to Ohm's law.
4: Ultrasonic selection misunderstanding. How much output power, oscillation frequency, and amplitude range to use should be considered according to the material of the workpiece, the area of the welding wire, whether there are electronic components in the workpiece, whether to airtight and other factors, mistakenly think that the greater the power, the better. This is also a misunderstanding.
