9 WELDING APPARATUS, NAMELY, WELDING POWER SUPPLIES, WIRE FEEDERS, MOTOR DRIVE AND POSITION CONTROLS, ARC VOLTAGE CONTROLLERS, PROGRAMMABLE CONTROLLERS FOR WELDING POWER SUPPLIES, ARC STARTING APPARATUS, WELD PROCESSING APPARATUS, IN-PROGRESS WELD QUALITY MONITORING APPARATUS, ULTRASONIC SOUND APPARATUS, VOLTAGE FLOW MONITORING APPARATUS, AND NON-WELDING PRECISION POWER SUPPLIES