1. A welding instructional system for simulating operations of a welding torch on a welding site, comprising: a welding torch simulator; display means for displaying images of the welding site; location detection means responsive to the display means and the relative location of the torch and the display means for producing a location signal indicative of the relative location; addressable memory means for storing information for generating, on said display means, different images of sequential stage of the welding site undergoing welding operation by the torch in dependence on said location signal; said addressable memory means also including audio visual instructions for demonstrating setup, welding and setdown techinques on said display means; and control means, including a computer and a control program, responsive to said location signal and the image currently displayed, for addressing said memory means to address the information used to generate images on said display means representative of changes between the welding site and said torch, said control means also selectively addressing said memory means to address the audio video instruction.