| 摘要 |
The opening degree of the two arms of a welding gun movable by a robot to a plurality of welding spots, each of the arms being equipped with an electrode tip, is detected when the arms are closed with no work clamped between them and compared with a lower limit opening degree value. The lower limit opening degree value is previously set to be equal to the opening degree experienced when the electrode tips are reduced to their lower usable limit. The comparison determines whether the tips need to be replaced. After replacement, the opening degree observed with the gun closed with no work clamped between the tips is compared to an upper limit opening degree value, previously set, to operate an alarm if a defective tip or an incorrectly mounted tip is present. |
