Copper-aluminum-bar welding ultrasonic machine is usually spot welded by 20kHz longitudinal vibration half-wave spot welding machine, and can also be spot welded by 20kHz bending vibration spot welding machine. The basic selection is based on the solder joint area: if the solder joint area is less than 100mm, choose the 5000w machine;If the area of the solder joint is greater than 100mm, choose the 7000W machine.
In aluminum welding, there is a difficulty in ultrasonic: the welding head sticks to the aluminum. Under the stricter technical requirements for tear residue indicators such as CATL, the stability requirements for equipment are even higher. The requirements of copper nickel plating layer make the wear resistance characteristics of the bottom anvil also increase accordingly.
Features of ultrasonic copper-aluminum welding equipment.
1.Microcomputer control, electronic tuning frequency, LCD display, power continuously adjustable, simple operation, stable and reliable work.
2.The welding is firm and consistent, and the weldment has the characteristics of firm welding surface, high strength, beautiful appearance and environmental protection.
3.Easy to operate, built-in electronic protection circuit, safe to use, used for the same kind of welding of metals, can carry out continuous and effective welding of non-ferrous metals.
4.It is widely used in battery copper-aluminum-bar welding.
5.The welding material is non-molten and does not have fragile metal properties.
6.Good conductivity after welding, with very low or near-zero resistivity.
7.It has low requirements for the welding metal surface, and can be welded by oxidation or electroplating.
8.The soldering time is short, and no flux, gas, or solder is required.
9.Welding is sparkless, environmentally friendly and safe.
In the process of accumulating welding experience in copper-aluminum bar, we found that many battery pack designers consider the functional structure design the most, and do not consider the workpiece cracks and increased welding difficulty caused by the forced vibration state when the workpiece is driven by the vibration source of the sonotrode when ultrasonic welding is used. In addition, the thickening of aluminum parts is another difficulty that the ultrasonic industry needs to improve and adapt.