Application of Ultrasonic Test System for Test Performance Improvement of Welding Flaw

Abstract

In this research, we used nondestructive test based on ultrasonic test as inspection method, and made up inspection robot in order to control of ultrasonic probe on the SWP surface, and programmed to signal processing code and pattern classifying code by user made programming code. For evaluation of flaw signal is reflected on welding flaw, user-made program codes are composed of signal processing and probability neural network (PNN) and backpropagation neural network (BPNN). And then, we actually confirmed to the theoretical advantage of each neural network method compared probability neural network with backpropagation neural network for classification and recognition rate. For the application of classifier to SWP inspection system, BPNN classifier is adequate in the first stage. And then, the application of PNN classifier is adequate as the next stage. Because of PNN application need enough sample data that is due to probabilistic density function.

Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

“…However, tens of thousands of antennas have to be deployed to cover all the spiral welds in the whole field pipeline. Ultrasonic inspection is to detect pipeline welds and defects by measuring the change of ultrasonic velocity in materials [15][16]. It has a deeper penetration depth than radiographic inspection technology, but usually needs to apply coupling agent on the surface, and it is not suitable for the detection of rough surface.…”