| 摘要 |
PROBLEM TO BE SOLVED: To provide an abnormality stop controlling method which stops operation soon after a friction stir connecting tool destructs in fatigue limit, and reduces defective joint portions generated with fatigue fracture of a tool as much as possible. SOLUTION: One means for solution is that the current value of a rotational driving motor of the friction stir connecting tool is compared with a standard value, when the current value gets to below 80% of the standard value, operation is stopped (stopping rotational driving motor and forward driving motor, or pulling up a connecting tool, or stopping forward moving action), and another means for solution is that the current value of a forward driving motor of the friction stir connecting tool is compared with a standard value, when the current value gets to below 80% of the standard value, operation is stopped (stopping rotational driving motor and forward driving motor).
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