A plastic housing with an ultrasonic welding connection, in particular for a Hydrostataktor and Hydrostataktor with this

The invention relates to a plastic housing (1) and a Hydrostataktor with this comprising a housing portion (2) having an opening (3) and introduced into it by means of ultrasonic closure piece (4), wherein an ultrasonic weld joint at a joint zone (7) having a first cross-sectional is trained. To produce the ultrasonic welding connection without residues form closure piece (4) and opening (3) in a joining direction of the ultrasonic welding connection to the joining zone (7) axially spaced apart from a deflector (15) for a welding expulsion of the ultrasonic welding connection.