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Comparison Corrosion Mapping Solutions using Phased Array and Conventional UT Techniques

There are many kinds of corrosion inspection solutions and choosing the right one may be complex. UT Corrosion mapping is a quantitative way to inspect the thickness of a material affected by corrosion. Oxidation or erosion reduces piece thickness and pulse-echoes distances are directly reduced. While one beam of a mono channel UT device can report one thickness at a time, a multi-beam or linear scan can produce an array of thicknesses. Both techniques are accurate but the inspection requirements may differ and so does the complexity of the setup. Today embedded software provides all the necessary tools to produce charts and spot mapping using a Mono channel UT setup. In addition to that, a PC software application can enhance the workflow by assisting the technician in producing the inspection scan plan, analyzing the data and comparing the information with previous results. For Phased Array techniques, embedded software typically does some corrosion inspection and mapping but with a much higher resolution and provides advanced analysis tools. The paper presented will compare Corrosion Mapping solutions using mono and phased array transducers. In addition, we will explore software solutions that improve inspection jobs. Advantages, benefits, results and limitations in corrosion inspection solutions will also be presented.

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