Ultrasonic Creeping Wave Testing Method for Small Diameter Pipe Welds
-
摘要: 采用爬波对小径管内壁1 mm×5 mm（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10～20 mm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ø1 mm横通孔制作DAC曲线，实测管内外壁1 mm×5 mm模拟裂纹时，其反射声压比DAC曲线高7～14 dB。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。Abstract: 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 1 mm, the reflected sound pressure for the simulated cracks (1 mm×5 mm) 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.
-
-
[1] 李阳,唐创基,李男.相控阵超声检测技术在海洋工程小径管对接焊缝检验中的应用[J].无损检测,2013,35(9):41-44. [2] 王维东,魏忠瑞, 韩玉峰,等.镍基高温紧固螺栓的超声波探伤工艺[J].无损检测,2014,36(5):49-51. [3] 罗琅,王建平,奚延安,等.N08810镍基合金焊缝的超声探伤[J].无损检测,2016,38(3): 60-65. [4] 王维东,王亦民, 孟倩倩,等.超超临界锅炉小径管焊缝的超声相控阵检测工艺[J].无损检测,2015,37(12):49-52. [5] 曹云峰,花喜阳,田尉建,等.镍基合金螺栓超声检测的典型案例[J].无损检测,2016,38(11):79-82. [6] 赛鹏,王佐森, 张建磊,等.焊缝根部及近根部垂直面积型缺陷的超声检测[J].无损检测,2016,38(9):53-56. [7] 颜哓亮,周清利.超声检测技术在核电站蒸汽发生器中的作用[J].无损检测,2016,38(1):63-65.
计量
- 文章访问数: 2
- HTML全文浏览量: 0
- PDF下载量: 2
下载:
