Re: [MW:18867] PWHT Requirement for dissimilar welding b/w P91 & SS304

Sa335 Gr P91 side to be buttered up to a minimum of 13mm with ERNiCr-3. Then PWHT to be done for that side as per the requirement of P91 to P91 welding (Normally 720 deg temperature up to a minimim of 2hrs). Then face prepration is to be done (Ensure a 13mm buttering after this face prepration)

Then prepare the joint b/w P91 and SS304 and weld with ERNiCr-3

No PWHT requirements after this

On Sun, Oct 6, 2013 at 2:05 AM, Octane Mac <octane.mac@gmail.com> wrote:

B31.3: 704-760 C, minimum holding time 2 hrs. Holding time 1hr/in.

B31.1: 730-775 C, minimum holding time 30 minutes. Holding time 1hr/in. Note: As it is a dissimilar material welding and a nickel based consumable is recommended therefore minimum holding temperature shall be 700 C.

Octane

On Fri, Oct 4, 2013 at 7:33 PM, Abhishek Rai <abhishekkrrai@gmail.com> wrote:

Dear Sir,

Please confirm the requirement of PWHT b/w welding of P91 & SS 304.the operating temperature of piping is 640 deg c .

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