Device and method for welding thin-walled work pieces using ultrasound

摘要

A device (10) for welding thin-walled work pieces (52) such as e.g. food containers of foil, fibrous web or foil-fibrous web composites using ultrasound has at least two components, i.e. a sonotrode (12) and a counter tool (14) for the sonotrode (12). One component (12) has a working region (16) which faces a working region (18) of the other component (14). The working region (18) of one component (14) comprises at least one projection (41) and the working region (16) of the other component (12) comprises at least one recess (46) into which the projection (41) can engage during the welding process. In this manner the work piece is securely held without slippage.