The Canaweld CAD 81 stud welding system offers a full 5/16-inch (M8) welding capacity and is the most compact system on the market. The CAD 81 is microprocessor controlled and has an improved charging circuit with a high output transformer that maximizes its duty cycle. The system includes enhanced user feedback including safety and fault codes. The CAD 81 is sold as a complete welding system including gun, two ground cables, collets, changing tools and carrying case.