Re: [MW:16564] PWHT soaking Time on SS Overlay

not permitted as per code

On 1/21/13, Prakash Hegde <pb.hegde@yahoo.com> wrote:
> Dear Mr Venu
>
> For weld overlay of( Corrosion resistance) A8 on P1 ,P4,P5 etc if PQR
> undergoesPWHT the Clause QW407.9 applies i.e.If PQR qualifies for alify
> for max 20hrPWHT with 1hr soaking time will qualies for 20hrs max for job
>
> Regards
>
> Hegde Prakash
>
>
> ________________________________
> From: venu moturu <moturuvenu@yahoo.com>
> To: "materials-welding@googlegroups.com"
> <materials-welding@googlegroups.com>
> Sent: Saturday, 19 January 2013 2:04 PMear Mr Venu
> Subject: [MW:16544] PWHT soaking Time on SS Overlay
>
>
> Dear experts ,
>
> The production weld ( corrosion resistance overlay (SS) 3mm was deposited
> on the AISI 4130 Thk 50mm by SMAW ) PWHT soaking time was exceeded the PQR
> soaking time more than 25% ,recommended by ASME Sec IX .
>
> QW-407.9 A separate procedure qualification is
> required for each of the following:
> (a) For weld corrosion-resistant overlay of A-No. 8 on
> all base materials, a change in postweld heat treatment
> condition in QW-407.1, or when the total time at postweld
> heat treatment encountered in fabrication exceeds 20 hr,
> an increase of 25% or more in total time at postweld heat
> treating temperature.
>
> Pl. advice on the above code case as the chemical composition on PQR meets A
> .no.8 of sec IX
>
> Best Regards
> Venu Moturu --
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>
>
>

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