Ultrasonic welding device, comprising: a sonotrode with a sonotrode surface; a lateral slide with a lateral slide surface; a touching element with a touching surface; an insertion chamber for inserting joining parts (110, 110'); wherein the insertion chamber is defined in a first axial direction (y) on a first side by the sonotrode surface and in a second axial direction (x) on a second side by the lateral slide surface and on a third side opposing the second side by the touching surface; characterized in that the ultrasonic welding device further comprises: a first receiving element with a first stop edge; a second receiving element with a second stop edge; wherein the first receiving element and the second receiving element are arranged to be movable in relation to each other between a starting position and an end position; wherein the first stop edge and the second stop edge are brought together in the end position opposite an open side of the insertion chamber to form a joining part receptacle for receiving the joining parts and are moved apart in the starting position; wherein the joining part receptacle is v-shaped in order to position the joining parts in the insertion chamber in the first axial direction (y) and the second axial direction (x). a sonotrode with a sonotrode surface; a lateral slide with a lateral slide surface; a touching element with a touching surface; an insertion chamber for inserting joining parts (110, 110'); wherein the insertion chamber is defined in a first axial direction (y) on a first side by the sonotrode surface and in a second axial direction (x) on a second side by the lateral slide surface and on a third side opposing the second side by the touching surface; characterized in that the ultrasonic welding device further comprises: a first receiving element with a first stop edge; a second receiving element with a second stop edge; wherein the first receiving element and the second receiving element are arranged to be movable in relation to each other between a starting position and an end position; wherein the first stop edge and the second stop edge are brought together in the end position opposite an open side of the insertion chamber to form a joining part receptacle for receiving the joining parts and are moved apart in the starting position; wherein the joining part receptacle is v-shaped in order to position the joining parts in the insertion chamber in the first axial direction (y) and the second axial direction (x). a first receiving element with a first stop edge; a second receiving element with a second stop edge; wherein the first receiving element and the second receiving element are arranged to be movable in relation to each other between a starting position and an end position; wherein the first stop edge and the second stop edge are brought together in the end position opposite an open side of the insertion chamber to form a joining part receptacle for receiving the joining parts and are moved apart in the starting position; wherein the joining part receptacle is v-shaped in order to position the joining parts in the insertion chamber in the first axial direction (y) and the second axial direction (x).