| 摘要 |
PROBLEM TO BE SOLVED: To effectively work an automatic control function, perform a pressure welding operation of high reproducibility so as to obtain a stable jointing quality even in case of a pressure welding material having a clearance such as a steel material. SOLUTION: In this control method, when the elapsed time is shorter than a tolerance range of a preliminary heating time A being preset, a final pressing is started after it reaches the tolerance range S, for example, at the point where it reaches 90% of the time A. When the elapsed time is longer than the tolerance ranges of the time A, the final pressurizing is started at that point, for example, at the point where it reaches 110% of the time A. In this case, settings of the time A and a lower limit pressure are designed to vary corresponding to operation circumstances.
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