| 摘要 |
PROBLEM TO BE SOLVED: To attain stable measurement without requiring measurement of the thickness of a second member in a case of measuring the penetration depth of a welding part in the second member of a T-shaped measured material.SOLUTION: With an ultrasonic beam 1102 transmitted from a phased-array probe 1100 arranged on a rear surface 2102 side of a first member 2100, a measurement device detects an end position A of a non-welding part in a second member 2200 and a position B of a welding toe part in the second member 2200, and calculates a penetration depth D of a welding part 2300 in the second member 2200 on the basis of the detected end position A of the non-welding part and the detected position B of the welding toe part. |
