Emat for inspecting thick-section welds and weld overlays during the welding process
OwnerSyed Mohamed Aliinventor
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Abstract
The invention relates to a method and system for monitoring the integrity of thick section welds during the welding process with electromagnetic acoustic transducers (EMAT). Using induction coils in properly arranged and oriented magnetic fields, EMATs can generate shear horizontally polarized (SH) skimming waves in the base metal adjacent to the weld. A through transmission method is adopted where by a transmitting EMAT is used to generate SH skimming waves on side of the weld while a receiving EMAT is used to sense and assess the ultrasonic signal acquired by a receiver EMAT on the other side of the weld there by indicating the quality of the most recent weld layer applied by the welder.
Claims10
A method of using SH EMATs whereby the EMAT design parameters such as meander coil size, conductor spacing, conductor angle, magnet array size, spacing and shape and EMAT system instrumentation operating parameters such as excitation frequency, magnetic bias field and the position of the EMAT with respect to the weld are optimized to generate, detect and measure SH skimming waves to monitor the integrity of thick section welds during the welding process.
Dependencies are inferred from the claim text.