How Does An Ultrasonic Metal Welding Machine Weld Copper Wires?

When ultrasonic welding is applied to copper wires, the basic principle is to utilize the high-frequency vibration energy generated by an ultrasonic generator. This energy is converted into high-frequency longitudinal vibration through a transducer and a welding head. When this vibration acts on the surface of the copper wires to be welded, it generates localized high-frequency friction and shear forces, causing intense intermolecular friction and heat generation in the copper wires, accompanied by plastic deformation. This allows the two copper wire cross-sections to achieve complete physical bonding in an instant, forming a stable welding point.

 

The specific steps for ultrasonic welding of copper wires are roughly as follows:

Preparation Stage:
Clean the ends of the copper wires, ensuring that the welding area is free of grease, oxides, or other contaminants.
It may be necessary to pre-position and fix the ends of the copper wires appropriately to accurately align the welding position.

 

Clamping and Positioning:
Use a special ultrasonic welding mold or fixture to precisely align and clamp two or more copper wires, maintaining a certain pressure.

 

Energy Transmission:
Start the ultrasonic generator; the energy is transmitted through the transducer to the welding head, and the contact area between the welding head and the copper wires begins to vibrate.

 

Welding Process:
The high-frequency vibration causes the contact surfaces of the copper wire ends to frictionally heat and melt in micro-regions in a very short time. Simultaneously, due to the pressure, the contact surfaces quickly fuse together, forming a strong welded joint.

 

Cooling and Shaping:
After stopping the ultrasonic vibration, the welded area cools and solidifies rapidly, forming a stable welded connection.

 

Quality Inspection:
Perform a visual inspection and necessary mechanical performance tests on the welded copper wires to confirm that the welding quality meets the requirements.

 

The advantages of ultrasonic welding of copper wires include high speed, high efficiency, no need for additional materials (such as solder), and the welded joint has high mechanical strength and good conductivity. It is widely used in various copper wire connection applications such as wires and cables, electronic component leads, and battery tabs.