Importance

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Abstract

There is provided a friction stir spot joining device in which a pin can be simply and surely caused to come into or out from a tip end of a joining tool by driving a pin extraction motor when the pin extraction motor is used so as to cause the pin to come into or out from the tip end of the joining tool. The friction stir spot joining device for softening and stirring works to be joined due to frictional heat generated by the rotation of the pin so as to perform spot joining contains a stirring motor for rotating the joining tool having the pin, a pressure application motor for linearly driving the joining tool so as to cause the pin to come in or come out from a tip end of the joining tool and a pin extraction motor disposed at the rear of the stirring motor on the same axis line as the stirring motor, while being integrated with the stirring motor, for causing the pin to come in or come out from a tip end of the joining tool, wherein the pressure application motor is disposed in parallel with the pin extraction motor and a pressure application screw shaft, operated by the pressure application motor, is disposed on the same axis line as the pin extraction motor.

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First Claim