Ultrasonic welding assembly, especially for plastics housing for electrical/electronic sensors, has a sonotrode projecting from a stack with a guide pin to work with a guide drilling at the component holder

The ultrasonic welding assembly has a sonotrode (4) on a stack (1). A holder (7) is opposite the stack with a component holder to take the component (6) for welding by the sonotrode. A system positions the stack and/or sonotrode in a direct relation to the component holder, during the separate welding processes. The ultrasonic welding assembly has a sonotrode (4) on a stack (1). A holder (7) is opposite the stack with a component holder to take the component (6) for welding by the sonotrode. A system positions the stack and/or sonotrode in a direct relation to the component holder, during the separate welding processes, with at least one guide pin (8) at the stack and/or sonotrode and at least one guide drilling (10) at the holder. The sonotrode extends from the stack, with its converter and booster, supported at a carrier. Es wird eine Ultraschallschweißanlage, eine Bauteilaufnahme für eine Ultraschallschweißanlage und ein Verfahren vorgestellt, mit denen Sonotrode und Bauteilaufnahme in der für den Schweißvorgang erforderlichen relativen Position zueinander während jedes einzelnen Schweißprozesses positioniert werden können.