INFRARED SENSING OF FULL PENETRATION STATE IN GAS TUNGSTEN ARC-WELDING

The objective of this study is to present an applicable top-side infra red sensing technique for the prospective closed-loop control of weld penetration in gas tungsten arc welding (GTAW). A model is developed t o calculate the full penetration state, which is specified by the back -side bead width, from the sensed infrared images. To ensure the model validity in the prospective closed-loop control, the experiments, whi ch generate the data for the model identification, are conducted under the experimental conditions that will be encountered during practical closed-loop control of the welding process. The heat transfer conditi on and electrode tip angle may vary during welding or from case to cas e. Also, the control variables which are used to adjust the weld proce ss in order to reach the required weld penetration will also change. I n many cases, the current can be employed as an on-line adjustable con trol variable because of the implementation ease, when the welding spe ed and arc length are maintained at the preset values. Thus, different currents, workpiece sizes, and electrode tip angles are arranged in t he experiments to emulate the possible current adjustments, case to ca se heat transfer variations, and electrode wear. The infrared characte ristics of the effects of these parameters are extracted to regress th e full penetration state. Finally, the back-side weld width (the full penetration state) is calculated using the resultant model from the se nsed infrared data.