C-SCOPE IMAGING SYSTEM OF EDDY CURRENT FLAW DETECTION RESULT FOR FATIGUE CRACK OF STEEL BRIDGE WELDED EDGE

PROBLEM TO BE SOLVED: To enable recording performance and objectivity of eddy current flaw detection result to be enhanced by excluding evaluation differences by judges.MEANS FOR SOLVING THE PROBLEM: C-scope imaging system of an eddy current flaw detection result for a fatigue crack of a steel bridge welded edge part comprises: a flaw detection unit; a processing part; and a display device. The flaw detection unit includes: an eddy current flaw detection probe; a scanner for welding; and a position encoder. The processing part includes: an eddy current flow processing part for calculating a voltage and a phase at a detection position; a judgement processing part for converting a voltage at the detection position into a length and converting the phase at the detection position into a line type; and an imaging processing part for preparing C-scope map information. A C-scope map that displays the eddy current flow detection result includes: a curve 8 similar to a movement path of the eddy current flaw detection probe; and a vertical line 9 in the normal direction at the position of the curve 8 corresponding to the detection position. A length of the vertical line 9 corresponds to a magnitude of the voltage at each detection position, and the line types A, B...(color coding) of the vertical line 9 correspond to the phase for each detection position.SELECTED DRAWING: Figure 3 【課題】判断者による評価の相違を排除して、渦流探傷結果の記録性および客観性を向上させる。【課題手段】鋼橋溶接止端部の疲労き裂に対する渦流探傷結果のＣ−スコープ画像化システムは、探傷ユニットと処理部と表示器とを有し、探傷ユニットは渦流探傷探触子、溶接部用スキャナー、位置エンコーダを具備し、処理部は検知位置における電圧および位相を算出する渦流探傷処理部、検知位置における電圧を長さに換算すると共に検知位置における位相を線種に換算する判定処理部、Ｃ−スコープ図情報を作成する画像化処理部を具備し、渦流探傷結果を表示するＣ−スコープ図は、渦流探傷探触子の移動経路に相似する曲線８と検知位置に対応した曲線８の位置における法線方向の垂線９とを有し、垂線９の長さは検知位置毎の電圧の大きさに対応し、垂線９の線種イ、ロ・・・（色分け）は検知位置毎の位相に対応している。【選択図】図３