The two workpieces must be weldable
Some of the different materials can be welded better, some are basically fused, and some are not fused. The melting point of the same material is the same, and it can be welded in principle, but when the melting point of the workpiece to be welded is greater than 350°C, ultrasonic welding is not suitable. Because ultrasound melts the molecules of the workpiece instantly, the judgment is based on the fact that it cannot be welded well within 3 seconds, and other welding processes should be selected. Such as hot plate welding. Generally speaking, ABS materials are easy to weld, while nylon or PP materials are difficult to weld.
There are certain requirements for the joint area
When instantaneous energy is generated, the larger the joint area, the more serious the energy dispersion, the worse the welding effect, and even the failure of welding. In addition, ultrasonic waves propagate longitudinally, and the energy loss is proportional to the distance. Long-distance welding should be controlled within 6 cm. The welding line should be controlled between 30 and 80 wires, and the arm thickness of the workpiece should not be less than 2 mm, otherwise it cannot be welded well, especially for products that require airtightness.
The thermal resistance must reach the melting point of the workpiece
After the ultrasonic transducer converts electrical energy into machinery, it is conducted through the material molecules of the workpiece. The acoustic resistance of the ultrasonic welding machine in the solid is much smaller than that in the air. When the sound wave passes through the joint of the workpiece, the acoustic resistance in the gap Larger, the heat generated is quite large. The temperature reaches the melting point of the workpiece first, and then a certain pressure is applied to weld the seams. The other parts of the workpiece will not be welded due to low thermal resistance.
Ultrasonic welding
Ultrasonic welding head structure requires strict inspection
Ultrasonic mold manufacturers have a set of strict inspection procedures for incoming materials, and the processing dimensions are processed after computer software simulation and verification. Quality is guaranteed. These processes cannot be done in general workshops. If the mold is not designed properly, the reaction problem is not obvious when welding small workpieces, and various drawbacks will appear when the power is high. In severe cases, the power components will be directly damaged.
In modern industry, we can see ultrasonic plastic welding machines everywhere. For example: product packaging, cutting, riveting, embossing, punching and other industries require ultrasonic welding machines, so a variety of ultrasonic welding with various functions has also emerged, with different application fields, usage methods and equipment requirements Very different.
The output power of ultrasonic welding machine must be constant
The output power of the ultrasonic plastic welding machine is determined by the diameter, thickness, material, and design process of the piezoelectric ceramic sheet. Once the ultrasonic transducer is shaped, the high power is also shaped. It is a complicated process to measure the output energy. It’s not that the larger the ultrasonic transducer and the more ultrasonic power tubes used in the circuit, the greater the output energy. It requires a very complex amplitude measuring instrument to accurately measure its amplitude.
Get out of the misunderstanding of ultrasonic welding machines
How much output power to use, the oscillation frequency, and the amplitude range should be considered according to factors such as the material of the workpiece, the area of the welding wire, whether there are electronic components in the workpiece, and whether it is airtight or not. Misunderstood that the greater the power, the better. This is also a misunderstanding. If you don’t know much about ultrasound. It is good to ask the regular engineering and technical personnel of the ultrasonic production plant. If you have the conditions, it is better to communicate with the manufacturer on-site, and do not blindly follow the misleading of some informal ultrasonic equipment sales personnel.
The correct use of the ultrasonic welding machine requires six major aspects: the thermal resistance must reach the melting point of the workpiece, the two workpieces must be weldable, the joint area has certain requirements, the output power of the welding machine must be measured, and the ultrasonic welding machine must be measured. Misunderstandings, welding mold structure requires strict inspection
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