Ultrasound welding device, wherein the ultrasound welding device has at least the following components: a sonotrode; an anvil; a touching element; a lateral slider; a first stop element; and a receiving chamber, in which joint partners are to be received and which is peripherally delimited by components (3, 5, 7, 9) of the ultrasound welding device; the receiving chamber being delimited on a first side by a surface of the sonotrode and on a second side opposite the first side by a surface of the anvil; the receiving chamber further being delimited on a third side by a surface of the touching element and on a fourth side opposite the third side by a surface of the lateral slider; the receiving chamber further being delimited, at least in one positioning arrangement which can be adopted by the first stop element, on a fifth side extending transverse to the first to fourth sides by a surface, facing the receiving chamber, of the first stop element; characterised in that the first stop element is formed electrically conductive on the surface thereof facing the receiving chamber, so as to form a first electrode; at least one of the components which peripherally delimit the receiving chamber, including the sonotrode, the anvil, the touching element and the lateral slider, being formed electrically conductive on the surface (21, 23, 25, 27) thereof facing the receiving chamber so as to form a second electrode; the ultrasound welding device having a functionality for discerning a desired positioning of joint partners which are to be welded within the ultrasound welding device, the ultrasound welding device being configured to detect an electrical connection between the first electrode and the second electrode and to discern on the basis thereof the desired positioning of at least one joint partner which is to be welded. a sonotrode; an anvil; a touching element; a lateral slider; a first stop element; and a receiving chamber, in which joint partners are to be received and which is peripherally delimited by components (3, 5, 7, 9) of the ultrasound welding device; the receiving chamber being delimited on a first side by a surface of the sonotrode and on a second side opposite the first side by a surface of the anvil; the receiving chamber further being delimited on a third side by a surface of the touching element and on a fourth side opposite the third side by a surface of the lateral slider; the receiving chamber further being delimited, at least in one positioning arrangement which can be adopted by the first stop element, on a fifth side extending transverse to the first to fourth sides by a surface, facing the receiving chamber, of the first stop element; characterised in that the first stop element is formed electrically conductive on the surface thereof facing the receiving chamber, so as to form a first electrode; at least one of the components which peripherally delimit the receiving chamber, including the sonotrode, the anvil, the touching element and the lateral slider, being formed electrically conductive on the surface (21, 23, 25, 27) thereof facing the receiving chamber so as to form a second electrode; the ultrasound welding device having a functionality for discerning a desired positioning of joint partners which are to be welded within the ultrasound welding device, the ultrasound welding device being configured to detect an electrical connection between the first electrode and the second electrode and to discern on the basis thereof the desired positioning of at least one joint partner which is to be welded.