Microprocessor controlled power unit with push-button control automatically recognises which welding accessories are fitted and adapts power and duration characteristics for optimum results. Includes operator override. Features pulse facility for welding high stress materials. Check-panel indicates machine status including: supply; thermostat; supply over/under voltage. Piggy-back water-cooler cools both power cables and arms for maximum duty-cycle. Supplied with pneumatic pincers and set of 120.803163 arms. Includes trolley.