钢管斜向缺陷的相控阵超声检测参数

以相控阵探头检测钢管的斜向缺陷为例,对斜向缺陷定义、相控阵探头的技术特点以及相控阵探头检测斜向内部缺陷、外部缺陷的适应性等主要参数进行分析,建立相应模型并加工了样管进行斜向缺陷检测试验。试验结果表明,对于通用的无缝管(直径厚度之比大于5),可采用相控阵探头偏置法对斜向内外缺陷进行检测。该结论可为钢管斜向缺陷检测工艺中相控阵探头的设计、选用等提供一定理论依据,也可为其他类似相控阵探头的设计、选用提供借鉴。

基于图像处理的钢管缺陷在线监测算法研究

针对钢管缺陷的X射线检测方法,目前主要采用对数字式X射线(DR)影像进行人工判读的方式来检测缺陷,该方法受主观因素影响大,工作强度高,效率低。为替代人工检视方法,依据DR影像特征,研究了基于数字图像处理的缺陷检测算法。实验结果表明,采用的算法具有良好的适应性,比传统方法检测出的细小缺陷的效率更高,可满足对缺陷进行在线监测的需求。

Experimental Investigation of Defects Inspection for FRP Pipeline based on Single-side NMR

The fiberglass reinforced plastic （FRP） pipelines have been used widely in oil-gas gathering and transportation. The defects of FRP pipelines would increase with the extension of service time. However, it is very difficult to detect the defects of FRP pipelines on-spot quickly. In this paper, a new method detecting defects for FRP pipes has been provided based on the NMR. The proton density distributions have been obtained at different depth of FRP components using single-side NMR. The experimental results show that there is a significant change of proton density distribution at the location of defects. And, these results would be useful for defects inspection of composite material component.