| 摘要 |
PROBLEM TO BE SOLVED: To quicken judgment of welding quality and to increase the accuracy of the judgment by monitoring a welded nugget production process under energizing utilizing a change in electric power difference between electrodes per half-cycle. SOLUTION: When welding current and voltage between electrodes changing every moment under energizing are detected at least per half-cycle and the difference in electric power is time sequentially monitored, the difference in electric power being obtained by subtracting, from the electric power applied to a work in the reducing process of the electric power between electrodes corresponding to the respective same current values in the increasing process and reducing process of welding current per half-cycle, the electric power applied to the work in the increasing process, a curve showing the behavior of the difference in electric power is expressed on a cycle diagram with the difference in electric power as the axis of ordinate and the cycle number as the axis of abscissa, and, from the change in the difference in electric power at the measurement reference point of the optional designated cycle number in the axis of abscissa, the evaluation of welding quality is performed under a welded nugget growing process. COPYRIGHT: (C)2006,JPO&NCIPI
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