Abstract
Based on the analysis of the gas tungsten arc welding (GTAW) arc spectrum, a composite light filter is designed. This filter and a normal charge coupled device camera form a vision sensor, which observes the GTAW weld pool from the topside of the workpiece. During the welding process, the captured image brightness is adjusted according to the magnitude of the welding current using software, and comparatively distinct images of the weld pool are obtained. The weld pool geometry is measured through an image processing algorithm developed by the present authors. The algorithm requires less than 70 ms to process an image frame in a 100 MHz main frequency computer, and therefore meets the requirements of real time measurement.
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