Measuring proximity of metal to an arc welding torch.

摘要

@ Apparatus for measuring the distance between an electric welding torch and a workpiece especially useful with an aluminum workpiece. A nonconsumable electrode is mounted adjacent the consumable electrode of the welding torch with the nonconsumable electrode electrically isolated from the consumable electrode. A power supply connected to the consumable electrode provides an auxiliary arc and developes a consumable electrode voltage proportional to the distance between the torch and the workpiece. The consumable electrode voltage can be used to develop signals which guide the torch along a groove in the workpiece.