Method and device for stamping and connecting plastic pieces

In an apparatus for punching and welding of plastic parts, an upper tool (10) and a lower tool (12) are provided which are adjustable along an axis (z) perpendicular to a workpiece plane (WE) relative to each other. A punching die (24, 44) and a sonotrode (26, 28, 46) on one of the tools (10, 12).