1. A method of controlling and simultaneously displaying on a video color display signals representative of the demand and actual welding parameters associated with an arc welding torch including the weld voltage, the weld current and the speed of a motor which sets the travel speed of the torch electrode relative to the workpiece or the feed rate of a consumable wire supplied to the weld area comprising: a) selecting a demand weld voltage, weld current and motor speed; b) supplying a weld voltage and a weld current to the torch in accordance with the selected demand values thereof; c) selecting a demand motor speed: d) controlling the speed of the motor in accordance with the selected demand value thereof; and e) displaying on the video color display signals representative of the selected demand values of the weld voltage, weld current and motor speed, each signal being displayed in a separate color and simultaneously displaying on the video color display, in real time, signals representative of the actual weld voltage, actual weld current and actual motor speed with the actual and demand value signals for each separate parameter being displayed in the same color, whereby an operator may readily correlate the demand and actual parameter values and ascertain deviations therebetween.