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Dissimilar Metal Weld Inspections
Dissimilar metal (DM) welds have become a major concern since PWSCC (Primary Water Stress Corrosion Cracking) was found in various PWR type nuclear plants. DM welds typically join two or more different materials, and mostly involve inconel alloys. Zetec has developed and formally qualified a solution for encoded manually driven phased array UT examination of dissimilar metal piping welds.
The qualification for dissimilar metal piping welds (obtained at PDI according to ASME Code Section XI, Appendix VIII,
Supplement 10) covers detection, length sizing and through-wall sizing of circumferential and axial cracks
in dissimilar metal piping welds from the outside surface, for diameters 1.5"NPS and up, and for wall thicknesses from
0.210" to 6.50" (5.3 to 165.1 mm). The procedure is applicable for dissimilar metal welds in both PWR and BWR nuclear plants.
This is the first procedure using phased array UT technology to be qualified for Supplement 10.
Click here to download the application note.
Zetec's solution employs the following equipment:
OmniScan PA
Zetec Manual Pipe Scanner
UltraVision 1.0 Software
Dual 2-D Matrix Array Probe
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