METHOD AND DEVICE FOR INSPECTING OBJECT FORMED BY FRICTION STIR JOINING

摘要

A method for inspecting the joint strength and region of an object formed by spot friction stir joining. An ultrasonic wave is made to enter into the object from a backing surface (25) on the opposite side of a joining tool immersion plane (24), and an ultrasonic wave reflected from the object (20) is taken in. A joint region (21) and joint strength are estimated without using an ultrasonic wave reflected from the bonding tool immersion plane but with the use of an ultrasonic wave reflected from the vicinity of Z position in the reference direction, which z position corresponds to the boundary surface (27) between the two joined members, and then the object is inspected based on the estimation results. Consequently, irregularities of a trace (29) of the joint formed on the joining tool immersion plane (24) is prevented, and joint quality can be inspected by estimating the bonding region (21) with the use of an ultrasonic and without breaking the objects (20).