S9074-AQ-GIB-010/248 Rev 1
NOTES (continued): 7. Where specified by note 5(c), dilution shall be determined as follows: (a) The test assembly shall be extended an additional 2 inches minimum and the first layer only shall be continued for an additional 2 inches minimum. (b) One additional macro-etch specimen shall be taken across this first layer clad weld 1 inch from the end of the full thickness clad weld. There shall be no differences in welding parameters from the rest of the first layer at this sectioned area. (c) This macro-etch specimen shall be etched and examined per note 4. Additionally, the two deepest penetrating beads shall be measured at their deepest point below the original base metal surface for total height (H) and depth below the original base metal surface (h). Measurements shall be to the nearest 1/64 inch. (d) Dilution for each bead shall be estimated in percent as (h/H) x 100. The dilution of each bead shall be averaged together and this average shall be evaluated against the criteria of note 5(c). Alternatively, if the full bead profile of each of the two deepest beads is clearly discernable, the actual dilution can be calculated according to standard area calculation methods. (e) Where a butter layer is employed, it shall count as one of the layers cited in note 5(c). Furthermore, the dilution evaluation shall be separately evaluated for the butter and clad layers. A portion of the butter layer shall also be machined flat prior to the application of the clad layer to permit accurate measurement of the clad layer’s penetration. Both layers shall meet the dilution values of note 5(c). (f) Dilution evaluation is not required where composition testing is performed.
Figure 7-4. Test Assembly for Procedure Qualification for Cladding for Corrosion-Resistance (Also, See Figure 7-5 for Cylindrical Materials) - Continued
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