Flux to be used in SAW with PWHT

[prashant pansare]

Dear all, My vendor is using WPS as follows: Process - FCAW + SAW Base Metal - S355 K2G3/ API 2H /2W GR 50 Thickness - 50 mm & above Wire for FCAW - E71T-1 Wire for SAW - EH 12K & Flux - F 7A8 Preheat Temp.- 100 to 125 deg.C PWHT  Temp. - 500 to 520 deg.C As per ASME Sec - II C Flux to be used shall be F 7P8 ( A denotes- as weld conditions & P denotes for PWHT)                            As  WPS includes PWHT Flux shall be used F 7P8. Pl. guide me, weather flux used by the vendor is acceptable & if not what is to be done for the weld joints,those have been welded till date.   Pl. reply urgently. PSP

[Bathula Raghuram (Mumbai - PIPING)]

what you PQR states , if it is qualified with PWHT and CVN impact (if required), rewrite the WPS/PQR with F7P8. else qualify new PQR with PWHT using same combination used on production

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of prashant pansare
Sent: Friday, July 23, 2010 11:04 AM
To: mat wel
Cc: par kat; roj abra; sol grea
Subject: [MW:6093] Flux to be used in SAW with PWHT

views and meant for educational 

[masthan]

In most cases flux manufacturer confirms the properties same F7A8 and F7P8. Just verify the flux bag you can find both F7A8 and F7P8. In this case you can accept previous weld joints.

 

M.M

 

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of prashant pansare
Sent: Friday, July 23, 2010 7:34 AM
To: mat wel
Cc: par kat; roj abra; sol grea
Subject: [MW:6093] Flux to be used in SAW with PWHT

 

Dear all,

 

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[Muhammed Ibrahim PK]

Hi,

 

If it is esab flux OK 10.62 & wire OK autrod 12.32, it will give same tensile strength after PWHT also.

Refer esab welding handbook.

Thanks & Regards
Muhammed Ibrahim PK

[John Henning]

The flux wire combination is acceptable provided the either the conditions of QW-409(b) or QW-409(c) are met, i.e. the flux is limited to the brand and type used in welding the PQR.  Obviously, the PQR should demonstrate that the required mechanical properties are  achieved.  Classification by the supplier is a simplification whereby you can substitute one manufacturers  product for another.  There are situations where the flux manufacturer either does not have sufficient demand or has not anticipated the need to perform a specific classification.  When an applicable SFA Classification does not exist, the Code allows the use of brand name and type, and compliance with QW-404.5 (chemistry or A-no.), in addition to mechanical testing to qualify the material.  (see interpretation IX-77-09 and interpretation IX-83-46 ).  Note that the Code does not permit reclassification by the user of the consumables, this is done solely by the consumable manufacturer (see IX-83-46, question 2). 

 

John

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of prashant pansare
Sent: Friday, July 23, 2010 12:34 AM
To: mat wel
Cc: par kat; roj abra; sol grea
Subject: [MW:6093] Flux to be used in SAW with PWHT

 

Dear all,

 

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