METHOD FOR CONNECTINGSTRANDED WIRES IN AN ELECTRICALLY CONDUCTING MANNER AND ULTRASOUND WELDING DEVICE

An ultrasound welding device and a method for connecting stranded wires in an electrically conducting manner with a metal U-shaped support by ultrasound welding, where the stranded wires are made of individual wires that are essentially aluminum. The sonotrode used according to the invention is a sonotrode has a welding surface which is shaped like an open trapezoid having short base sides as the bottom face during welding, the stranded wires directly contacting the bottom face and the lateral faces that extend therefrom and form an obtuse angle. The overall cross-sectional area FL of the stranded wires inserted in the U-shaped support and the cross-sectional area FS of the space surrounded by the bottom face and the lateral faces have a relationship FS