Partial Penetration Overlay Base Metal Thickness - ASME Section IX
Partial Penetration Overlay Base Metal Thickness - ASME Section IX
(OP)
Good afternoon, everyone. I have done a PQR using this: 
Originally I used the PQR base metal thickness as 1/2" but the customer is saying it should be 1" on both the PQR and the WPS. This is for a 625 overlay with mechanicals to meet "as part of the design criteria" in API 6A. I am unclear as to why it would be 1" over 1/2" or visa versa. To me Table QW-453 states it should be T qualified which would be 1/2".

Originally I used the PQR base metal thickness as 1/2" but the customer is saying it should be 1" on both the PQR and the WPS. This is for a 625 overlay with mechanicals to meet "as part of the design criteria" in API 6A. I am unclear as to why it would be 1" over 1/2" or visa versa. To me Table QW-453 states it should be T qualified which would be 1/2".





RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
However, are you taking credit for the strength of the overlay in the design of the flange? If so, this is no longer considered a CRO WPS and instead would be a groove weld procedure qualification.
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
Okay, I understand this because it's not only acting as a corrosion resistance barrier. Would I still use the same table for CRO procedure qualification or use the gtaw groove table? I ended up writing it up using the CRO essential variables and the customer accepted it. I did end up changing it to 1" as per their request.
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
Okay, great. Thank you. Is there a place in Section IX that states something like what you are saying? While I agree with you, I am just curious if I had missed a section about this besides the partial pen ~= groove weld.
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
Please see below in the 2013 Edition of ASME Section IX;
QW-202.3 Weld Repair and Buildup. WPS qualified
on groove welds shall be applicable for weld repairs to
groove and fillet welds and for weld buildup under the following
provisions:
(a) There is no limitation on the thickness of base metal
or deposited weld metal for fillet welds.
(b) For other than fillet welds, the thickness range for
base metal and deposited weld metal for each welding
process shall be in accordance with QW-451, except there
need be no upper limit on the base metal thickness provided
qualification was made on base metal having a thickness
of 11/2 in. (38 mm) or more.
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX
Is not a CRO WPS qualified on T less than 1" good for T qualified to unlimited? That's how I read QW-453
Ignoring PP and Strength as stated above.
RE: Partial Penetration Overlay Base Metal Thickness - ASME Section IX