Patent ID: 8047782

Claim:
A hydrodynamic machine for a turbine compound system, said hydrodynamic machine comprising: a bladed primary wheel; a bladed secondary wheel, said bladed primary and secondary wheels together forming a work space; a housing which encloses said bladed primary wheel and said bladed secondary wheel and which includes sheet metal, said housing including at least two individual sheet metal components which are placed on at least one of said bladed primary wheel and said bladed secondary wheel, which are aligned with each other at a joint abutment, and which are welded together to form a welded said joint abutment; and a relief in an area of the hydrodynamic machine associated with said welded joint abutment, said relief being open toward said welded joint abutment and extending along said welded joint abutment in a surface of at least one of said bladed primary wheel and said bladed secondary wheel.