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[MW:22480] Inconel 600 weld overlay on SA 387 Gr 12 CL.2 material

By Materials & Welding
Tube sheet Material- SA 387 Gr.12 CL.2 (P4 Gr 1- 1Cr, 0.5Mo)
Weld Overlay: Inconel 600 (SB 168 UNS N06600)
Welding Process: SMAW (ENiCrFe-3 Brand-Inconel 182)
Question:
1) Here we were used ENiCrFe3 electrode (Dia. 3.25 current range 96-105 Amp) for weld overlay on P4 material, after completing barrier layer (Preheat 100C with interpass Max. 150C) followed by two subsequent layers to achieve 8mm thk. (PT done by each layer and found satisfactory). After Completion of welding 1mm layer machined and as per our requirement we did UT examination and found some discontinuity between 7 to 9 mm from top of overlay. (UT can not define type of discontinuity)
2) Now we prepared mock up of same tubesheet material (SA 387 Gr.12 CL.2) with same consumable (ENiCrFe3), again same problem observed in UT examination.

We need experts advice on that matter.
*** Can we change consumable brand ???
*** It is problem of UTcalibration block

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