1. A dual-spectrum digital imaging arc welding system providing enhanced discrimination between arc welding characteristics to a user, said system comprising: a welding headgear configured to be worn on a head of a user and to shield at least the eyes of said user from spectral radiation emitted by an arc welding process; a visible-spectrum (VS) digital camera physically integrated with said welding headgear and configured to provide raw VS real-time digital video image frames; an infrared-spectrum (IRS) digital camera physically integrated with said welding headgear and configured to provide raw IRS real-time digital video image frames; an optical display assembly physically integrated with said welding headgear and configured to present real-time digital video images to said user while said user is wearing said welding headgear; and a vision engine operatively interfacing with said VS digital camera, said IRS digital camera, and said optical display assembly, wherein said vision engine is configured to produce at least dual-spectrum (DS) real-time digital video image frames from said raw VS and raw IRS real-time digital video image frames.