| 摘要 |
PROBLEM TO BE SOLVED: To provide a spot welding machine capable of reliably detecting defects such as missing of a work and biting of foreign matters before executing the spot welding. SOLUTION: The spot welding method for performing welding by holding and pressing overlapped works 6 by a fixed electrode 3 and a movable electrode 4, and allowing the current to run between the electrodes 3 and 4 comprises a step of measuring the position of the movable electrode 4 when the works 6 are held by the electrodes 3 and 4 before the actual welding work, and storing the measured value as the reference value TH, a step of measuring the position TR of the movable electrode 4 when the works 6 are held by the electrodes 3 and 4 when performing the actual welding work, and a step of comparing the position TR with the reference value TH, performing the welding work if the position TR is within a predetermined range with respect to the reference value TH, and stopping the welding work by providing an alarm if the position TR is not within the predetermined range. COPYRIGHT: (C)2005,JPO&NCIPI
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