| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for friction stir welding and a device for friction stir welding capable of accurately carrying out determination of quality of a jointing part.SOLUTION: A device for friction stir welding 1 detects vibration acceleration in a main axis part of a rotation tool 3 during friction stir welding and calculates a median value, average value and standard deviation of its output signal waveform. There is a tendency that frequency distribution of the output signal waveform of the vibration acceleration follows to a normal distribution when the friction stir welding is carried out normally. Therefore, a degree of deviation in the frequency distribution of output signal waveform of vibration acceleration from the normal distribution is understood by analysis of the detected output signal waveform and comparison of the difference between the median value and the average value, and the standard deviation with a predetermined threshold. Based on this matter, accurate determination of the quality of the jointing part W may be carried out. |
