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为了进一步提高探伤结果的可靠性及重复性,正确确定标准试块的加工精度,正确选用标准试块,正确地使用缺陷当量计算滑尺,以及对制定探伤标准提供一定的依据,我厂对斜探头中厚板焊缝超声探伤中Κ值的有关误差因素及其影响,作了分析及试验验证。斜探头Κ值的测定方法在超声波斜探头焊缝探伤中,预先应测定探头的前沿长度ι及折射角Κ值。一、在半圆试块(如SG-Ⅱ)或其它圆弧试块上(如IIW试块等)测定探头
In order to further improve the reliability and repeatability of testing results, correctly determine the machining accuracy of the standard test block, the correct selection of standard test block, the correct use of defect equivalent weight slide, as well as provide a basis for the development of testing standards, The error factor and its influence on the value of Κ in the ultrasonic inspection of medium and heavy plate weld of probe are analyzed and verified by experiment. Measurement method of skew probe Κ value In the ultrasonic skew probe weld inspection, the length of the probe should be determined in advance ι and refraction angle Κ value. First, in the semi-circular test block (such as SG-Ⅱ) or other arc test block (such as IIW test block, etc.) to determine the probe