A tube assembly (300; 1000) comprising: at least a first tube (302; 1002) and a second tube (304; 1004) configured for coupling at respective ends (308; 1012), the first and second tubes each include: a base material having a specified mechanical characteristic; and a weld interface (422; 1022) at the respective end, the weld interface being proximate to an inner diameter (402; 1008) and an outer diameter (404; 1010) of the first and second tubes; and a work hardened weld assembly (310B; 1024) coupling the base material of each of the first and second tubes, the work hardened weld assembly includes: a weld fusion zone (420; 1030) having a tapered configuration, which extends laterally from the inner diameter to the outer diameter of the first and second tubes, wherein the weld fusion zone, the weld interfaces and the base material of the first and second tubes form a stacked configuration; weld interface segments, included in the weld interface, wherein the weld interface segments extend from proximate the inner diameter to proximate the outer diameter of the first and second tubes; wherein the weld interface segments are sandwiched between the weld fusion zone and the base material of the respective first or second tubes as layers of the stacked configuration; and wherein the weld fusion zone and the weld interface segments of the first and second tubes are work hardened, such that the weld interface segments of the first and second tubes and the weld fusion zone include mechanical characteristics approaching, namely equaling or near to the mechanical characteristics of the base material of the first and second tubes, wherein work hardening of the weld assembly is achieved through application of force transverse to the stacked configuration. at least a first tube (302; 1002) and a second tube (304; 1004) configured for coupling at respective ends (308; 1012), the first and second tubes each include: a base material having a specified mechanical characteristic; and a weld interface (422; 1022) at the respective end, the weld interface being proximate to an inner diameter (402; 1008) and an outer diameter (404; 1010) of the first a base material having a specified mechanical characteristic; and a weld interface (422; 1022) at the respective end, the weld interface being proximate to an inner diameter (402; 1008) and an outer diameter (404; 1010) of the first and second tubes; and a work hardened weld assembly (310B; 1024) coupling the base material of each of the first and second tubes, the work hardened weld assembly includes: a weld fusion zone (420; 1030) having a tapered configuration, which extends laterally from the inner diameter to the outer diameter of the first and second tubes, wherein the weld fusion zone, the weld interfaces and the base material of the first and second tubes form a stacked configuration; weld interface segments, included in the weld interface, wherein the weld interface segments extend from proximate the inner diameter to proximate the outer diameter of the first and second tubes; wherein the weld interface segments are sandwiched between the weld fusion zone and the base material of the respective first or second tubes as layers of the stacked configuration; and wherein the weld fusion zone and the weld interface segments of the first and second tubes are work hardened, such that the weld interface segments of the first and second tubes and the weld fusion zone include mechanical characteristics approaching, namely equaling or near to the mechanical characteristics of the base material of the first and second tubes, wherein work hardening of the weld assembly is achieved through application of force transverse to the stacked configuration. a weld fusion zone (420; 1030) having a tapered configuration, which extends laterally from the inner diameter to the outer diameter of the first and second tubes, wherein the weld fusion zone, the weld interfaces and the base material of the first and second tubes form a stacked configuration; weld interface segments, included in the weld interface, wherein the weld interface segments extend from proximate the inner diameter to proximate the outer diameter of the first and second tubes; wherein the weld interface segments are sandwiched between the weld fusion zone and the base material of the respective first or second tubes as layers of the stacked configuration; and wherein the weld fusion zone and the weld interface segments of the first and second tubes are work hardened, such that the weld interface segments of the first and second tubes and the weld fusion zone include mechanical characteristics approaching, namely equaling or near to the mechanical characteristics of the base material of the first and second tubes, wherein work hardening of the weld assembly is achieved through application of force transverse to the stacked configuration.