PISTON ASSEMBLY WITH WELD SUPPORT

摘要

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston may include a piston body defining a piston axis, the piston body having a skirt and forming a lower surface of a cooling gallery. The body may include radially inner and outer body mating surfaces. The piston may further include a cooling gallery ring cooperating with the piston body to form the cooling gallery. The piston body and cooling gallery ring may be joined together along radially inner and radially outer interface regions to form a generally one-piece piston assembly. In some exemplary approaches, mating surfaces of the body and ring may be positioned adjacent a support surface configured to inhibit or prevent weld spatter formed in a process joining the ring and body from the cooling gallery.

主权项

1. A method, comprising:
providing a piston body defining a piston axis and at least a portion of an upper combustion bowl surface, the piston body forming a lower surface of a cooling gallery, the body including radially inner and outer body mating surfaces; assembling a cooling gallery ring with the piston body, the cooling gallery ring including a radially inner ring mating surface and a radially outer ring mating surface; laser welding the body to the cooling gallery ring along a radially inner interface region, the radially inner interface region including the radially inner mating surfaces of the body and the cooling gallery ring; and laser welding the body to the cooling gallery ring along a radially outer interface region, the radially outer interface region including the radially outer mating surfaces of the body and cooling gallery ring; wherein at least one of the mating surfaces includes a step portion supporting an adjacent interface region between the cooling gallery ring and the piston body.