Re: [MW:16549] PWHT soaking Time on SS Overlay

In my opinion it is applicable only when total PWHT time exceeds 20 hours.

On Sat, Jan 19, 2013 at 2:04 PM, venu moturu <moturuvenu@yahoo.com> wrote:

 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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