Introduction of Ultrasonic Metal Welding Machine
1. The origin of ultrasonic metal welding machine
Ultrasonic metal welding was discovered by accident in the 1830s.
At that time, during the current spot welding electrode plus ultrasonic vibration test, it was found that it could be welded without current, so the ultrasonic metal cold welding technology was developed. It is similar to friction welding, but there are differences. Ultrasonic welding has a short time and the temperature is lower than recrystallization; 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, the tangential vibration removes the oxides on the metal surface, and the protruding part of the rough surface produces repeated micro-welding and destruction, which increases the contact area and increases the temperature of the welding zone. High, plastic deformation occurs at the interface of the weldment. In this way, 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. The welding time is too long, or the ultrasonic amplitude is too large, which will reduce the welding strength or even destroy it.
2. Principle of ultrasonic metal welding machine
Ultrasonic metal welding uses tens of thousands of high-frequency vibration waves per second to be transmitted to the surface of two metal workpieces to be welded, and then a certain pressure is applied to make the metal surfaces rub against each other to form a fusion between molecular layers to achieve welding the goal of.
3. Features and advantages and disadvantages of ultrasonic metal welding machine:
(1)-Two objects to be welded are overlapped and joined by ultrasonic vibration and pressure to form a solid state, the joining time is short, and the joining part does not produce cast structure (rough surface) defects.
(2)-Compared with the method of ultrasonic welding and resistance welding, the mold life is long, the mold repair and replacement time is less, and it is easy to realize automation.
(3)-Ultrasonic welding can be carried out between the same metal and different metals, which consumes much less energy than electric welding.
(4)- Compared with other pressure welding, ultrasonic welding requires less pressure, and the deformation amount is less than 10%, while the deformation of the workpiece in cold pressure welding is 40%-90%.
(5)-Ultrasonic welding does not require pre-treatment of the welded surface and post-weld post-treatment like other welding.
(6)-Ultrasonic welding does not require external factors such as flux, metal filler, external heating, etc.
(7)-Ultrasonic welding can reduce the temperature effect of the material to a relatively low level (the temperature of the welding zone does not exceed 50% of the melting temperature of the welded metal), so that the metal structure does not change, so it is very suitable for welding applications in the electronic field.
(1) High fusion strength;
(2)Close to cold processing, the workpiece is not annealed, and there is no trace of oxidation;
(3)After welding, the conductivity is good, and the resistivity is extremely low or nearly zero;
(4)Low requirements on the surface of the weld metal, both oxidation and electroplating can be welded;
(5)The soldering time is short, without any flux, gas, or solder.
(6)Ultrasonic spot welding machine has no sparks, environmental protection and safety.