小径管焊缝的超声爬波检测方法  

Ultrasonic Creeping Wave Testing Method for Small Diameter Pipe Welds

作　　者：王维东[1] 张振华[1] 曹云峰[1] 王亦民[2] 魏忠瑞 肖潇 

机构地区：[1]徐州电力试验中心,徐州221009 [2]国网安徽省电力公司电力科学研究院,合肥230601 [3]山东瑞祥模具有限公司,济宁272400 [4]常州超声电子有限公司,常州213000

出　　处：《无损检测》2017年第7期28-32,60,共6页Nondestructive Testing

摘　　要：采用爬波对小径管内壁1mm×5mm(深度×长度)模拟裂纹制作DAC(距离-波幅)曲线,在距离小径管焊缝模拟缺陷10~20mm间以直射波覆盖全焊缝扫查,水平定位可直接读取缺陷位置。当采用横波检测时,以?1mm横通孔制作DAC曲线,实测管内外壁1mm×5mm模拟裂纹时,其反射声压比DAC曲线高7~14dB。试验结果表明,横通孔与点状和面状真实缺陷的反射声压差较大,如果采用小径管内壁等深模拟裂纹制作DAC曲线,在定量检测时可避免误差。A DAC（distance-amplitude）curve for detecting the 1 mm×5 mm（depth times length）simulated crack of small diameter tube inner wall was made by using the creeping wave.If tested with a direct wave range covering the whole weld at a distance of 10-20 mm from the simulated pipe weld defects,the horizontal positioning can directly read the defect position with quantitative accuracy.When the shear wave was used and DAC curve was made through drill hole of diameter 1mm,the reflected sound pressure for the simulated cracks（1mm×5mm）of both inside and outside the tube should be 7-14 dB higher than DAC curve.The experimental results show that the reflecting acoustic pressure by transverse through hole and point and planar defect has big difference,and therefore if making DAC curve by the equal depth simulated crack of small diameter tube inner wall,the quantitative errors can be avoided.

关 键 词：小径管 超声爬波检测 模拟裂纹 

分 类 号：TG115.28[金属学及工艺—物理冶金]