Ultrasonic copper spot welding machine
Ultrasonic metal welding is also widely used in the electronics industry, electrical appliance manufacturing, the preparation of new materials, aerospace and nuclear energy industries, food packaging boxes, and high-part sealing technology. It is much less than electric current welding. Ultrasonic is used as ultrasonic metal. A low-power application of welding, often used for welding transistors or integrated circuit leads. When used for sealing welding of medicines and explosive materials, it can avoid the pollution of medicines caused by the general welding method due to dissolved substances, and will not cause an explosion due to heat or sparks. For the construction of a resource-saving and environment-friendly modern society in China, ultrasonic metal welding will play a great role in promoting.
Principles and characteristics of ultrasonic metal welding
Principle of Ultrasonic Metal Welding Ultrasonic metal welding was discovered accidentally in the 1830s. At that time, when doing electric current spot welding and ultrasonic vibration test, it was found that the welding could be done without current, so the ultrasonic metal cold welding technology was developed. Although ultrasonic welding was discovered earlier, its mechanism of action is still not very clear so far. It is similar to friction welding, but there are differences. Ultrasonic welding takes a short time and the temperature in the local welding zone is lower than the recrystallization temperature of the metal; it is also different from pressure welding because the static pressure applied is much smaller than that of pressure welding. It is generally believed that in the initial stage of the ultrasonic welding process, tangential vibration removes oxides on the metal surface, and causes repeated micro-welding, deformation and destruction of the protruding part of the rough surface to increase the contact area and increase the temperature of the welding zone. High, plastic deformation occurs at the interface of the weldment. Under the action of contact pressure, when they approach each other to the distance at which atomic gravity can act, a solder joint is formed. At present, a generally recognized explanation of the principle of ultrasonic metal welding is: when welding metal materials, the ultrasonic generator generates super-frequency vibration current, and then the transducer uses the inverse piezoelectric effect to convert it into elastic mechanical vibration energy, and Input to the weldment through the acoustic system. Under the combined action of static pressure and elastic vibration energy, the contact interface of the two welded workpieces destroys the oxide film or other surface attachments through friction, temperature rise and deformation, and makes the metal atoms between the pure interfaces infinitely approach, resulting in Combine and diffuse to achieve a reliable connection.
Advantages of ultrasonic metal welding
①Ultrasonic metal welding has low pressure, low energy consumption, and can weld dissimilar metal materials. Based on these characteristics, metal parts can be quickly formed by comprehensive use of ultrasonic metal welding technology and CNC milling technology, and functional devices can be embedded in the forming process to make smart metal-based composite materials.
②Metal ultrasonic welding machine can perform spot welding and continuous welding, and its welding speed is fast. In terms of application range, even if the physical properties of the materials are very different, they can be welded well; it can also be used for welding of metal foils, filaments, tiny devices, and thick and thin, multi-layer metal sheets that cannot be effective by other methods.
③Ultrasonic metal welding has high strength, good stability, and high fatigue strength.
Ultrasonic metal spot welder
④ The welding process does not need to use water cooling and gas protection, the deformation of the welded workpiece is very small, and the workpiece does not need to undergo heat treatment such as annealing after the welding is completed. The ultrasonic metal welding process itself contains the effect of breaking and cleaning the surface oxide layer of the welded parts, and the welding surface is clean and beautiful, and there is no need to perform post-weld cleaning like other welding methods.
⑤The ultrasonic welding of metal does not need welding rod, the welding area is not energized, and the metal to be welded is not directly heated. For welding the same workpiece metal, compared with electrode arc welding and gas welding, the energy consumption of ultrasonic welding is much smaller.
