Several points to pay attention to during ultrasonic welding

1. Get out of the misunderstanding of ultrasonic welding:

How much oscillation frequency, output power, amplitude range, etc. are used depends on factors such as the wire area of the workpiece, the material, whether the workpiece is airtight, whether it is airtight, or whether it is a component. The mistake is that the bigger the power, the better. This is a misunderstanding. If you are not too familiar with ultrasound, it is best to consult relevant engineering and technical personnel.

2. The welding die structure needs to be strictly tested:

The regular ultrasonic mold production feed has a set of strict inspection procedures. The processing dimensions are processed by computer software simulation and verification, and the quality is guaranteed. These processes are generally impossible to do. For example, if the mold is not properly designed, the reaction problem is not obvious when welding small workpieces. When there is high power, various disadvantages will occur. In severe cases, the power will be directly damaged. element.

3. The thermal resistance of the welding should reach the melting point of the workpiece:

After the ultrasonic transducer converts the electrical energy into a mechanical device, it conducts through the material molecules of the workpiece. The ultrasonic acoustic wave conducts the acoustic resistance in the solid much less than the acoustic resistance in the air. When the acoustic wave passes through the joint of the workpiece, the acoustic resistance in the gap is large. The heat generated is quite large. The temperature reaches the melting point of the workpiece, plus a certain pressure, so that the joint is welded. The other parts of the workpiece are not welded due to low thermal resistance and low temperature.

4. Solderability of two workpieces during welding:

Some kinds of materials can be better welded, some are basically meltable, and some are not melted. The melting point between the same material is the same, and in principle 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. Since the ultrasonic is instantaneously melting the workpiece molecules, it is judged that within 3 seconds, the welding cannot be performed well, and other welding processes need to be selected. Generally speaking, ABS material is the easiest to weld, and nylon or PP material is generally weldable.

5. The welding area has certain requirements:

When the instantaneous energy of the ultrasonic is generated, the larger the welding area, the larger the energy dispersion, and the worse the welding effect, and the welding may not be possible. In addition, the ultrasonic wave is transmitted longitudinally, the energy loss is proportional to the distance, and the long distance welding should be controlled within 6 cm. The welding line should be controlled between 30 and 80 filaments. The arm thickness of the workpiece should not be less than 2 mm, otherwise it will not be welded well, especially for products requiring airtightness.

6. Ultrasonic welding output power should be balanced:

The size of the mechanical output power is determined by the thickness and diameter of the piezoelectric ceramic piece, the design process, and the material. When the ultrasonic transducer is shaped, the maximum power is also fixed. Measuring the output energy is a complicated process, not a complicated process. The larger the ultrasonic transducer, the larger the output energy of the circuit. The more the ultrasonic power tube, the more complex the amplitude measuring instrument is needed to accurately measure its amplitude.

Post time: Mar-26-2021