Abstract: A method includes positioning a bushing in a bore of a turbine housing; positioning a shaft of a wastegate in a bore of the bushing where the shaft includes a shaft shoulder and a shaft end; applying force to a plug of the wastegate to substantially center the plug with respect to a wastegate seat of the turbine housing; positioning a resilient metal wire mesh ring at least in part in the bore of the bushing and between the shaft shoulder and the shaft end; encasing the ring into the bore of the bushing; and fixing a control arm to the shaft.

Abstract: A component for a turbocharger can include a shaft made of a first material where the shaft includes a turbine wheel end and a shaft axis; a turbine wheel made of a second material where the turbine wheel includes a shaft end and a turbine wheel axis; a weld joint formed by solidification of at least a portion of a weld pool that includes the first material and the second material, where the weld joint joins the turbine wheel end of the shaft and the shaft end of the turbine wheel and where the weld joint includes an inner radial border and an outer radial border; a reservoir disposed radially inwardly of the inner radial border of the weld joint; and a solidified portion of the weld pool disposed in the reservoir. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: A unit for a turbocharger can include a turbine wheel portion that includes a turbine wheel material and a turbine wheel axis; a shaft portion that includes a shaft material and a shaft axis; a first weld that includes a first average axial position over a first azimuthal span and first weld composition formed of a greater proportion of the turbine wheel material than the shaft material; and a second weld that includes a second average axial position over a second azimuthal span and second weld composition formed of a greater proportion of the turbine wheel material than the shaft material, where a sum of the first azimuthal span and the second azimuthal span is approximately 360 degrees, where the first average axial position differs from the second average axial position, and where the first weld composition differs from the second weld composition.

Abstract: A unit for a turbocharger can include a turbine wheel portion that includes a turbine wheel material and a turbine wheel axis; a shaft portion that includes a shaft material and a shaft axis where the shaft material includes a molybdenum content less than 0.5 percent by weight; and a weld that includes a nail shape in cross-section where a head portion of the nail shape includes an axial dimension of approximately 1 mm or less and wherein a shank portion of the nail shape includes an axial dimension of approximately 0.4 mm or less.

Abstract: A method can include positioning a bushing in a bore of a turbine housing; positioning a shaft of a wastegate in a bore of the bushing where the shaft includes a shaft shoulder and a shaft end; applying force to a plug of the wastegate to substantially center the plug with respect to a wastegate seat of the turbine housing; positioning a ring at least in part in the bore of the bushing and between the shaft shoulder and the shaft end; and fixing the ring to the bushing.

Abstract: A method can include co-axially locating a turbine wheel and a shaft where a force applicator applies an axially directed force to the turbine wheel, where the turbine wheel transfers at least a portion of the force to shaft and where a rotatable shaft collet supports the shaft; rotating the rotatable shaft collet; energizing at least one laser beam; and, via the at least one laser beam, forming a weld between the turbine wheel and the shaft.

Abstract: A system can include a controller; a force applicator; a rotatable shaft centering collet; a drive mechanism that rotates the rotatable shaft centering collect; and a laser beam unit.

Abstract: A unit for a turbocharger can include a turbine wheel portion that includes a turbine wheel material and a turbine wheel axis; a shaft portion that includes a shaft material and a shaft axis where the shaft material includes a molybdenum content less than 0.5 percent by weight; and a weld that includes a nail shape in cross-section where a head portion of the nail shape includes an axial dimension of approximately 1 mm or less and wherein a shank portion of the nail shape includes an axial dimension of approximately 0.4 mm or less.

Abstract: A system can include a controller; a force applicator; a rotatable shaft centering collet; a drive mechanism that rotates the rotatable shaft centering collect; and a laser beam unit.

Abstract: A method can include co-axially locating a turbine wheel and a shaft where a force applicator applies an axially directed force to the turbine wheel, where the turbine wheel transfers at least a portion of the force to shaft and where a rotatable shaft collet supports the shaft; rotating the rotatable shaft collet; energizing at least one laser beam; and, via the at least one laser beam, forming a weld between the turbine wheel and the shaft.

Abstract: A unit for a turbocharger can include a turbine wheel portion that includes a turbine wheel material and a turbine wheel axis; a shaft portion that includes a shaft material and a shaft axis; a first weld that includes a first average axial position over a first azimuthal span and first weld composition formed of a greater proportion of the turbine wheel material than the shaft material; and a second weld that includes a second average axial position over a second azimuthal span and second weld composition formed of a greater proportion of the turbine wheel material than the shaft material, where a sum of the first azimuthal span and the second azimuthal span is approximately 360 degrees, where the first average axial position differs from the second average axial position, and where the first weld composition differs from the second weld composition.

Abstract: A system can include a linkage that includes a turnbuckle component fixed between extensions of a rod end, a turbine assembly that includes a rotatable wastegate poppet arm connected to a pivotable wastegate valve control arm coupled to the rod end of the linkage by a peg, and an actuator that includes a translatable rod connected to the turnbuckle component of the linkage to pivot the wastegate valve control arm and rotate the wastegate poppet arm. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: An exemplary semi-floating bearing for a turbocharger has a central axis defining a cylindrical coordinate system with an axial direction, a radial direction and an angular direction; a turbine end; a compressor end; journal surfaces between the turbine end and the compressor end, the surfaces configured to support a turbocharger shaft; and an opening disposed between the turbine end and the compressor end, the opening having a radial dimension that exceeds an axial dimension to, upon receipt of a locating pin, provide for movement of the bearing in the angular direction about its central axis and to provide for lesser movement of the bearing in the axial direction. Other exemplary bearings, arrangements and methods are also disclosed.

Abstract: A component for a turbocharger can include a shaft made of a first material where the shaft includes a turbine wheel end and a shaft axis; a turbine wheel made of a second material where the turbine wheel includes a shaft end and a turbine wheel axis; a weld joint formed by solidification of at least a portion of a weld pool that includes the first material and the second material, where the weld joint joins the turbine wheel end of the shaft and the shaft end of the turbine wheel and where the weld joint includes an inner radial border and an outer radial border; a reservoir disposed radially inwardly of the inner radial border of the weld joint; and a solidified portion of the weld pool disposed in the reservoir. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: A system can include a linkage that includes a turnbuckle component fixed between extensions of a rod end, a turbine assembly that includes a rotatable wastegate poppet arm connected to a pivotable wastegate valve control arm coupled to the rod end of the linkage by a peg, and an actuator that includes a translatable rod connected to the turnbuckle component of the linkage to pivot the wastegate valve control arm and rotate the wastegate poppet arm. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: An exemplary semi-floating bearing for a turbocharger has a central axis defining a cylindrical coordinate system with an axial direction, a radial direction and an angular direction; a turbine end; a compressor end; journal surfaces between the turbine end and the compressor end, the surfaces configured to support a turbocharger shaft; and an opening disposed between the turbine end and the compressor end, the opening having a radial dimension that exceeds an axial dimension to, upon receipt of a locating pin, provide for movement of the bearing in the angular direction about its central axis and to provide for lesser movement of the bearing in the axial direction. Other exemplary bearings, arrangements and methods are also disclosed.