Detection of Signals of Mock-up Pipes of Carbon Steel and Stainless Steel using Guided Ultrasonic Waves due to Magnetostrictive Sensors

A piping mock-up with a diameter of 6 inch and schedule number 80 of carbon steel and stainless steel were fabricated. The signals of weldments of these pipes were detected with a torsional vibration mode of frequency of 32 kHz using sensors, such as a pure Ni or a 49Fe-49Co-2V alloy strip. The signals from the 49Fe-49Co-2V alloy strip sensor were more detectable than those from the Ni strip sensor. The signals of 49Fe-49Co-2V alloy strip sensor of tile stainless steel piping mock-up were more detectable than those of 49Fe-49Co-2V alloy strip sensor of the carbon steel piping mock-up.