Ultrasonic nondestructive evaluation of welds in clad piping systems

许多工业管道系统，例如那些用于海上石油和天然气开采的系统，很容易受到管道内腐蚀性流体的**攻击。因此，管道可以具有由非各向同性材料如不锈钢或Inconel**制成的保护性内层或覆层。为了避免管道失效带来的昂贵和环境**破坏性影响，将两个相邻管段连接在一起的焊缝在施工后进行超声波**检查。在这个项目中，我们试图开发更准确的技术来使用二维超声阵列进行**这些检查。通过将从焊接缺陷反射后在所有**阵列单元接收的信号组合在一起，人们可以专注于感兴趣的区域，从而获得更**准确的信息。然而，这种技术非常耗时，需要大量的计算机**数据存储和处理能力。我们将开发检测方法和信号处理**技术，以使过程更有效，同时保持高精度。

Many industrial piping systems, such as those used for off-shore oil & gas recovery, are vulnerable to attack via**from the corrosive fluids inside the pipe. Therefore, the pipes may have a protective inner layer or cladding**made from a non-isotropic material such as stainless steel or Inconel. To avoid the costly and environmentally**devastating effects of a pipe failure the weld seam linking two adjacent pipe sections together is ultrasonically**inspected after construction. In this project, we attempt to develop more accurate techniques for conducting**these inspections using two-dimensional ultrasonic arrays. By combining together the signals received at all the**array elements after reflection from weld defects, one can focus on the areas of interest and thereby get more**accurate information. However, such techniques are time consuming and require great amounts of computer**data storage and processing power. We will be developing inspection methods and signal processing**techniques to make the process more efficient while maintaining high accuracy.