Non-destructive inspection of projection or spot welds - where welding electrode movement is used to indicate weld quality

摘要

Process for the non-destructive inspection and control of welded joints where electrode movement occurs during welding, esp. in spot- or projection welding in which the electrode movement is measured an a defect indicated if the electrode movement is below a prescribed min. value. A defect is pref. also detected if the electrode movement exceeds a prescribed max. value. In the pref. welding plant, the presence of a defect results in the clamping of the workpiece so that it cannot be removed until a release signal is applied. Immediate indication of faulty welds while the workpiece is on the welding plant is obtd.