| 摘要 |
PURPOSE:To polish the electrode tip of a robot and to maintain the uniform quality of welding by joining plural test pieces by spot welding, measuring the nugget diameter in the joint part thereof, comparing the same with a set value and discriminating the presence or absence of the need for polishing the electrode tip. CONSTITUTION:An inspecting position 12 is set adjacently to the welding robot 11. The plural test pieces 13 are gripped and superposed by and on piece holders 15, 16 in the position 12 and are subjected to spot welding by the robot 11. The joint point 17 of the test piece 13 after the welding is stripped and the nugget of one test piece 13 is photographed by a TV camera 19, etc. and the image thereof is processed, by which the nugget diameter is measured. The measured diameter is compared with the preset nugget diameter and the presence or absence of the need for polishing the electrode 21 tip is discriminated. A tip dresser 20 polishes automatically the electrode part of the robot 11 when the need for polishing is discriminated.
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