| 摘要 |
A resistance welding apparatus includes a power supply, a pair of welding electrodes and a welding circuit which is operative for controlling the operation of the electrodes to effect a welding operation. The welding circuit is operative for controlling the operation of the electrodes so that a welding operation can only be carried out on a workpiece assembly in the event that the resistance in the circuit path between the electrodes is within a range which is not likely to cause arcing between one or both of the electrodes and the workpiece assembly. The welding circuit further includes a current comparator for controlling the level of the current passed through the electrode during a welding operation.
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