Re: [MW:28598] Deformation during PWHT - P92

This is bulging?

any welded valves adjacent which is 1500 or 2500 ratings?

Did you carriedout postheating after welding?

Did you had bolt torquing either side fixed strongly?

Is there any distortion after welding and carriedout PWHT without any rectifications?

Or Modifcations done for repairs (Cutout or partial repairs) before PWHT?

Basically, distortion or deformation will not come under NDE and even your Hardness gets accepted, for this you need do Metallographic Examination as special case for root causes, anyhow this cases shall be rejected visually regardsless of NDE and to know the root cause welder or welding inspector fully assigned can give you the real scenario, catch the welder or ground level workers to scrutinize the root cause.

Regards,

Muneeb. 

From: José Luís Ferreira

Date: 2018-11-06 07:54

To: Materials & Welding

Subject: [MW:28567] Deformation during PWHT - P92

After the PWHT it was observed that along the side of the weld a deformation appeared as a collapsed pipe (see figure). After the PWHT were performed hardness test (ICU) and PAUT. All tests were accepted.

The main hypothesis about the causes of the occurrence is related to the thermal expansion constraint (due to heavy equipment and fixation devices).

PWHT Parameters:

Temp. 760 ° C

Time: 2h

Thickness: 15.1mm

Material: A335 Gr.P92

Position: vertical (tube)

Has anyone seen this? What can happen to the mechanical properties of this material? Some bibliographical references that follow. indicate to follow for an opinion?

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