1. A method for quantitatively assessing a weld joint, the method comprising: positioning a radiation source adjacent a weld joint of a workpiece, the radiation source aligned to direct a radiation beam onto the weld joint; positioning a detector adjacent the weld joint along a side of the workpiece opposite the radiation source, the weld joint positioned between the radiation source and the detector; obtaining a radiographic image of the weld joint by directing the radiation beam toward the weld joint and onto the detector; and determining a weld joint quality rating based at least in part on the radiographic image.