连铸坯超声波探伤

Ultrasonic Testing Of Continuous Casting Blanks

用垂直探伤法探测连铸坯内部缺陷,使用脉冲波声压公式,计入表面耦合声能损失和材质衰减损失的分贝数补偿,计算出缺陷的当量尺寸。用双晶斜探头探测连铸坯近表面的皮下气泡和皮下夹杂,用试块对比法确定缺陷的大小,把所得结果与酸蚀试验进行比较,最后得到连铸坯质量。

The internal defects of continuous casting blanks are tested by means of normal beam testing. The estimation size of defects is counted by using a formula of pulse acoustic pleasure and counting dB correction for surface coupling lose and material attenuation.Near surface blebs and slags are tested to use double crystal technique,defects size is determined by means of reference block.To compare the result with the etching testing,the rules of quality classification of continuous casting blanks are presented