Patent ID: 7798002

Claim:
An automatic ultrasonic examination device to check automatically quality of a spot-welded portion of a test object, comprising: an ultrasonic test instrument including an ultrasonic probe to send ultrasonic waves and to detect reflected waves while being in contact with the spot-welded portion, the ultrasonic probe being configured to provide a plurality of estimated values indicating a state of the spot-welded portion with reference to pieces of test information obtained around a central axis of a real center location while pivoting on a contact point between the ultrasonic probe and the real center location, and an ultrasonic test instrument main device connected to the ultrasonic probe to convert reflected wave detection signals received from the ultrasonic probe into the test information; a robot arm including a plurality of joints to adjust three-dimensionally posture and location of the ultrasonic probe relative to the spot-welded portion; and a control device being connected to the ultrasonic test instrument and robot arm to communicate data and signals with the ultrasonic test instrument and robot arm, the control device including a real center location identifying unit to identify the real center location of the spot-welded portion with reference to pieces of test information obtained around a preset tentative center location of the spot-welded portion, an optimum estimated value computing unit causing the ultrasonic probe to pivot on the contact point around the central axis to obtain the plurality of estimated values, the optimum estimated value computing unit to select an optimum estimated value from the plurality of estimated values, and a determination unit to check quality of the spot-welded portion with reference to the optimum estimated value obtained by the optimum estimated value computing unit.