Patent ID: 9193006
Filing Date: 2015-11-24
Classification: B23K

Abstract:
1. A friction stir welding apparatus comprising: a welding tool having a probe that is vertically movable with respect to a processing target side surface of a processing target member and rotatable with respect to the processing target member; a mounting member on which the processing target member is mounted; a movement mechanism having an arm to which a fitting jig fitted with the welding tool is fixed to move the welding tool with respect to the processing target member by moving the arm; and a displacement detecting device detecting displacement of the welding tool caused by deformation of the fitting jig, at a time of performing friction stir welding in which the arm is moved to move the welding tool with respect to the processing target member, while stirring the processing target member by rotating the probe with respect to the processing target member and pressing the probe to intrude into the processing target member, wherein the fitting jig is deformed at the time of performing friction stir welding, wherein the displacement detecting device includes a first pair of displacement sensors, fixed to the welding tool, and a second pair of members, fixed to a fixing portion between the fitting jig and the arm, wherein the first pair of displacement sensors are contact-type displacement sensors each including a contact member, and the second pair of members each includes a first end fixed to the fixing portion, a second end opposite to the first end, and an extending portion extending with respect to the fitting jig between the first end and the second end without being constrained, with the respective contact members of the first pair of displacement sensors being to contact with corresponding one of the second ends, and wherein moving directions of the contact members are parallel to a central axis of the probe, and the contact members and the second ends are correspondingly arranged symmetrically with respect to the central axis of the probe.