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

Claim 8:
9. A friction stir welding method for welding welding target members to each other by friction stir welding, the method comprising:
(a) setting a reference state quantity and a predetermined state quantity range before the friction stir welding is started;
(b) measuring a current state quantity during the friction stir welding; and
(c) comparing the current state quantity with the predetermined state quantity range, wherein
a first correction mode in which a welding tool position indicating a position of a welding tool in a Z-axis direction is corrected based on a variable correction quantity calculated by a predetermined operational expression is executed when the current state quantity measured in (b) is within the predetermined state quantity range, and
a second correction mode in which the welding tool position is corrected based on a preset fixed correction quantity is executed when the current state quantity measured in (b) exceeds the predetermined state quantity range in a direction of being further separated from the reference state quantity.