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preheat temp

preheat temp

preheat temp

(OP)
I had a customer spec which states that min preheat temp for material having tensile above 485 Mpa shall be 100 C. My material is LTCS A350 LF2 & A333 Gr 6.
I have a previously qualified PQR in which preheat temp was 80 C.
I submitted the same for approval & it got rejected only because preheat in PQR was 80 C though i mentioned preheat in WPS 100 C min.
can i have a chance to convince customer with existing PQR.Design code is 31.3 & thickness of job is 10.97 mm.

RE: preheat temp

There is no metallurgical reason to preheat the subject weld to 100 C when a (near matching chemistry) low hydrogen filler metal is used. Regarding your impact tested PQR qualified per ASME IX with 80 C preheat, it satisfies ASME IX and from the language of the Owner's specification presented the contract requirements for procuction welds to be preheated to 100C.  

RE: preheat temp

A PQR per ASME IX allowes to lower the preheat on the WPS with 55 Deg. C (so to 25 Deg. C minimum) and increase unlimited except when impact testing is required. In that case the increase allowed is 55 Deg.C (so to max. 105 Deg. C).
In both cases your 100 Deg. specified should be accepted.

RE: preheat temp

Lahane,
Show your client Table 330.1.1 from B31.3.
There is nothing remotely near 100 degrees C for that wall thickness,
Regards,
Kiwi

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