Patent ID: 9314870
Filing Date: 2016-04-19
CPC Classification: B23K

Claim Text:
1. A friction stir spot welding device that is configured to weld an object to be welded by partial stirring of a rotating tool, the device comprising: a cylindrical pin member as the rotating tool, the pin member configured to rotate about an axis and be advanceable and retractable in the axial direction; a tubular shoulder member configured to surround the pin member, rotate coaxially with the pin member, and be advanceable and retractable in the axial direction; a tool driving section configured to cause each of the pin member and the shoulder member to advance and retract along the axis; a tool driving control section configured to control the action of the tool driving section, to advance and retract the pin member and/or the shoulder member so that the pin member and/or the shoulder member is brought into contact with a surface of the object to be welded and to adjust a press-fit depth of the pin member and/or the shoulder member from the surface of the object to welded; and a memory section configured to store pressurizing force adjusting data used for controlling the action of the tool driving section, by the tool driving control section; wherein the tool driving control section is configured to control the tool driving section based on the pressurizing force adjusting data read from the memory section so that a multiplication value of a cross-sectional area of a front end surface of pin member and a distance the pin member advances or retracts from the surface of the object to be welded is substantially equal to a multiplication value of a cross-sectional area of a front end surface of the shoulder member and a distance the shoulder member retracts or advances from the surface of the object to be welded.