Ultrasonic welding method and ultrasonic welding part

An ultrasonic welding method for welding an electrically conductive contact element to at least two conductors of different electrically conductive materials, wherein the ultrasonic welding method comprises:

• arranging the contact element and a first conductor portion of a first one of the conductors between an anvil and a sonotrode;
• welding the first conductor portion to the contact element, wherein the anvil and the sonotrode are moved relative to each other in opposite directions to press the contact element and the first conductor portion against each other, and wherein the sonotrode vibrates with ultrasonic vibrations;
• arranging the contact element, which is welded to the first conductor portion, and a second conductor portion of a second one of the conductors, the electrically conductive material of which differs from an electrically conductive material of the first conductor, between the anvil and the sonotrode so that the second conductor portion lies between the sonotrode and the first conductor portion welded to the contact element;
• and
• welding the second conductor portion to the first conductor portion welded to the contact element, wherein the anvil and the sonotrode are moved relative to each other in the opposite directions to press the first conductor portion welded to the contact element and the second conductor portion against each other, and wherein the sonotrode vibrates with ultrasonic vibrations.