Patent ID: 11897048
Assignee: HITACHI POWER SOLUTIONS CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 1:
2. The friction stir welding apparatus according to claim 1, wherein
the apparatus body
sets a reference state quantity which is a reference of the state quantity, a first threshold value separated from the reference state quantity in a direction in which the state quantity is small by a predetermined quantity, a second threshold value separated from the reference state quantity in a direction in which the state quantity is large by a predetermined quantity, a third threshold value which is larger than the first threshold value and is separated from the reference state quantity in the direction in which the state quantity is small by a predetermined quantity, and a fourth threshold value which is larger than the second threshold value and is separated from the reference state quantity in the direction in which the state quantity is large by a predetermined quantity,
executes the first correction mode when the state quantity is between the first threshold value and the third threshold value or when the state quantity is between the second threshold value and the fourth threshold value, and
executes the second correction mode when the state quantity exceeds the third threshold value in a direction of being further separated from the reference state quantity or when the state quantity exceeds the fourth threshold value in a direction of being further separated from the reference state quantity.