A repaired piston (10, 110,210,610,710,810,910, 1010) comprising: a piston body (12, 612) defining a longitudinal axis (14, 614), and including a first body end having a crown (16, 616), a second body end having a skirt (18, 618), and an outer body surface (28, 628) extending axially between the first and second body ends (615, 616) and circumferentially around the longitudinal axis (14, 614); the crown (16, 616) being composed of abase material (34, 634) and a welding filler material (38, 638), and including an annular rim (24, 624, 724, 824, 924) extending circumferentially around a combustion bowl (22, 622) and in a radially outward direction from the combustion bowl (22, 622) to the outer body surface (28, 628); the annular rim (24, 624, 724, 824, 924) being formed primarily of the base material (34, 634) and secondarily of the welding filler material (38, 638), and having therein a finite number of repaired defects (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') each formed by a void in the base material (34, 634) filled by the welding filler material (38, 638) or by a mixture of the base material (34, 634) and the welding filler material (38, 638), characterized by: the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') having a spatial distribution limited by a multidirectional spacing parameter, such that a distance, in any direction, between any two of the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') is at least as great as a diameter of either of the two; and the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') further having a size distribution limited by a unidirectional sizing parameter varying as a function of distance from the combustion bowl (22, 622), such that each of the repaired defects (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') has a diameter of about 40% or less of a distance, in the radially outward direction, of the repaired defect (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') from the combustion bowl (22, 622). a piston body (12, 612) defining a longitudinal axis (14, 614), and including a first body end having a crown (16, 616), a second body end having a skirt (18, 618), and an outer body surface (28, 628) extending axially between the first and second body ends (615, 616) and circumferentially around the longitudinal axis (14, 614); the crown (16, 616) being composed of abase material (34, 634) and a welding filler material (38, 638), and including an annular rim (24, 624, 724, 824, 924) extending circumferentially around a combustion bowl (22, 622) and in a radially outward direction from the combustion bowl (22, 622) to the outer body surface (28, 628); the annular rim (24, 624, 724, 824, 924) being formed primarily of the base material (34, 634) and secondarily of the welding filler material (38, 638), and having therein a finite number of repaired defects (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') each formed by a void in the base material (34, 634) filled by the welding filler material (38, 638) or by a mixture of the base material (34, 634) and the welding filler material (38, 638), characterized by: the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') having a spatial distribution limited by a multidirectional spacing parameter, such that a distance, in any direction, between any two of the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') is at least as great as a diameter of either of the two; and the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') further having a size distribution limited by a unidirectional sizing parameter varying as a function of distance from the combustion bowl (22, 622), such that each of the repaired defects (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') has a diameter of about 40% or less of a distance, in the radially outward direction, of the repaired defect (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') from the combustion bowl (22, 622). the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') having a spatial distribution limited by a multidirectional spacing parameter, such that a distance, in any direction, between any two of the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') is at least as great as a diameter of either of the two; and the repaired defects (32', 632, 632a, 632b, 632c, 732, 732', 832, 932, 932') further having a size distribution limited by a unidirectional sizing parameter varying as a function of distance from the combustion bowl (22, 622), such that each of the repaired defects (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') has a diameter of about 40% or less of a distance, in the radially outward direction, of the repaired defect (632, 632a, 632b, 632c, 732, 732', 832, 932, 932') from the combustion bowl (22, 622).