Weld Repair procedure on clad surface

[vinit vani]

Dear all,

In one of our export Job, we are facing following problem at the last stage. Expert comments will be highly appretiated in this regard.
The details are as follows.
Design code ASME SEC VIII DIV 1
MOC-SA516GR 70+ SB 424 UNS NO8825(Alloy 825)
BASIC CONCERN- At the last stage of visual inspection ,TPI found some dent marks depth max upto 0.7mm on the 3mm thk clad surface.
The job is already passed in hydro test after PWHT.
Now to do repair of these dent marks we have proposed GTAW Process for base metal
SB 424 UNS NO8825 TO SB424 UNS NO 8825.
This was by considering the repair only at clad surface & not in base metal i.e.SA516GR70.
Client Remarks- GTAW weld overlay Process to be qualified instead of GTAW butt joint Process with all applicable tests along with Hardness Test.
Pl note that This is basically a clad repair procedure and to demonstrate a no new HAZ formation on the base metal
PL SHARE YOUR COMMENTS ABOUT SUITABILITY OF PROCESS.

Best Regards,

Vinit

[prem_nautiyal26]

Hi

How visual inspection can be last stage ? Is it so as per approved QAP.

Why were these so called  dent marks on clad surface not observed during visual and final dimension inspection before releasing the equipment for hydro test ? Also they could have been highlighted during weld visual and final LPT of the weld.

Regards

Prem Nautiyal

9769316004

Sent from Samsung Mobile

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[Sachin Varia]

I understand weld overlay is for corrosion resistance only in this case and not considered in strength calculation.

 

What is weld overlay thickness. & Check with design what minimum weld overlay thickness is acceptable.  It can be merged to surround overlay weld metal if thickness permits.

 

Regards,

Sachin

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