ULTRASONIC FLAW DETECTION DEVICE AND ULTRASONIC FLAW DETECTION METHOD

To provide a flaw detection device which is the device for non-destructively inspecting soundness of a front surface and inner side of a structure material and which reliably detects a flaw in a portion with limited accessibility.SOLUTION: An ultrasonic flaw detection device 100 detects a flaw by defining respective welding parts 14, 16 of two plates 13, 15 mutually attached at an interval by confrontation as an inspection object. The ultrasonic flaw detection device 100 includes: at least one probe 111 having a plurality of ultrasonic elements aligned in a longitudinal direction; a probe holding drive mechanism 120 for holding the probe and moving it by driving; and an ultrasonic flaw detector 113 for driving reception/transmission of an ultrasonic wave by the probe 111 so as to perform signal processing based on a reflection wave from the inspection object. The probe holding drive mechanism 120 includes: a short axis inclination correction section for performing driving to change a short axis inclination being a circumferential direction angle with respective longitudinal directions of the probe as axes; and a long axis inclination correction section for performing driving to change a long axis inclination being an angle with respect to the longitudinal directions of the probe.SELECTED DRAWING: Figure 1 【課題】非破壊で構造材の表面および内部の健全性を検査装置で、アクセス性の限られた部位を、確実に探傷する探傷装置を提供する。【解決手段】超音波探傷装置１００は、互いに面間に間隔をあけて取り付けられた２枚の平板１３，１５のそれぞれの溶接部１４、１６を検査対象として欠陥を探傷する。超音波探傷装置１００は、長手方向に配列された複数の超音波素子を有する少なくとも一つのプローブ１１１と、これを保持し移動駆動するプローブ保持駆動機構１２０と、プローブ１１１による超音波の受発信を駆動し前記検査対象からの反射波に基づいて信号処理を行う超音波探傷器１１３とを備える。プローブ保持駆動機構１２０は、プローブのそれぞれの長手方向を軸にして周方向の角度である短軸傾きを変更するように駆動する短軸傾き補正部と、プローブの長手方向に対しての角度である長軸傾きを変更するように駆動する長軸傾き補正部とを有する。【選択図】図１