| 摘要 |
PROBLEM TO BE SOLVED: To decrease defects of quality of welded products and to improve the yield of welding process. SOLUTION: In the resistance welding equipment 1, a control part 7 allows a first measurement current Ix, smaller than a welding current Iz necessary for the resistance welding, to be supplied to a member 2 to be welded and allows a voltage Vx between electrodes to be measured prior to the welding every time when a pair of members 2 to be welded combined in a state that the faces to be joined are in contact with each other are fitted to the electrodes 3A and 3B. A conduction resistance Rx of the whole members to be welded prior to the welding is derived on the basis of the measured voltage Vx and the first measurement current Ix, the resistance welding of members 2 to be welded is performed while controlling a welding power source 4 and a pressurizing source 5 in accordance with a regulated welding condition on the basis of the conduction resistance Rx before the welding. After performing, the controlling part 7 allows the second measurement current Iy smaller than the welding current Iz to be supplied to the welded members 2 and allows the voltage Vy between the electrodes to be measured, and the quality of the welded product is evaluated on the basis of the conductive resistance Ry of the whole welded members derived after the welding on the basis of the measured voltage Vy and the second measurement current Iy.
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