Purpose This specification provides a standard for performance@ inspection@ and procurement of transferred arc plasma welding systems exclusive of weld positioners@ weld manipulators@ and other mechanical tooling devices. This standard lists minimum requirements and is not to limit design advances. Classification The plasma welding systems shall consist of the.following types@ sizes@ and class. Type I. DC Constant Current II. DC Pulsed Power (Optional) Size A. 15 A (Low) B. 125 A (Medium) C. 400 A (High) Class Transferred plasma arc