Patent ID: 9587740
Date: 2017-03-07
CPC Classifications: B23K,B23P,F02F,F16J,G06Q,Y02P

Claim:
1. A repaired piston comprising: a piston body defining a longitudinal axis, and including a first body end having a crown, a second body end having a skirt, and an outer body surface extending axially between the first and second body ends and circumferentially around the longitudinal axis; the crown being composed of a base material and a welding filler material, and including a combustion face formed by an annular rim extending circumferentially around a combustion bowl and in a radially outward direction from the combustion bowl to the outer body surface; the annular rim being formed primarily of the base material and secondarily of the welding filler material, and having within the combustion face a finite number of repaired defects each formed by a void in the base material filled by the welding filler material or by a mixture of the base material and the welding filler material; the repaired defects having a spatial distribution limited by a multidirectional spacing parameter, such that a distance, in any direction, between any two of the repaired defects is at least as great as a diameter of either of the two; and the repaired defects further having a size distribution limited by a unidirectional sizing parameter varying as a function of distance from the combustion bowl, such that each of the repaired defects has a diameter of about 40% or less of a distance, in the radially outward direction, of the repaired defect from the combustion bowl; and the annular rim adjoins the combustion bowl at an inner perimetric edge, and adjoins the outer body surface at an outer perimetric edge, and wherein the repaired defects are located outside of a standback zone in the annular rim free of repaired defects, and wherein the standback zone extends in the radially outward direction from the inner perimetric edge.