| 摘要 |
<P>PROBLEM TO BE SOLVED: To form a proper nugget diameter in a state where dust is not generated even if an electrode is going to wear out in resistance welding. Ž<P>SOLUTION: In a resistance welding control method, a plurality of workpieces 2 are pressurized with a pair of electrodes 1a, 1b, with a prescribed welding current Iw energized only for a prescribed welding period Twr for welding. The maximum value is computed for an inter-electrode resistance value Rw during welding excluding the initial state immediately after the start of welding. Also, the inter-electrode resistance value Rw is computed at the point of time elapsed of the welding period Twr, with a difference determined between the maximum value of the inter-electrode resistance value and the inter-electrode resistance value at the point of time elapsed of the welding period. When this difference is equal to or larger than a predetermined reference value Rtr, welding is completed and, when the difference is lower than the reference value Rtr, the welding period is extended. The inter-electrode resistance value Rw during this extended period is computed by the moment, with the welding stopped when the difference between the maximum value of the inter-electrode resistance value and the inter-electrode resistance value during the extended period becomes equal to or larger than the reference value. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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