9 WELDING EQUIPMENT-NAMELY, WELDING POWER SOURCES, ELECTRODES, WIRE DRIVES AND SYSTEMS COMPRISING ESSENTIALLY A WELDING WIRE CONTAINING SPOOL, AN ORBIT ARM FOR UNREELING WIRE FROM SUCH SPOOL, A TRANSPARENT SHROUD ENCLOSING THE ORBIT ARM AND THE SPOOL, A POWER SOURCE TO PROVIDE ELECTRICAL CURRENT TO THE WELDING GUN, A WELDING WIRE DRIVE MECHANISM, AND A WELDING GUN