Re: [MW:24272] P-91 to SS Welding

No way you risk sensitization of 316

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From: Kannayeram Gnanapandithan Sent: Πέμπτη, 11 Φεβρουαρίου 2016 - 12:15 To: materials-welding Reply To: materials-welding@googlegroups.com Subject: Re: [MW:24262] P-91 to SS Welding

u can use ER NiCr3 /ENiCrFe2 direct welding  with preheat and pwht

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

On Thu, Feb 11, 2016 at 2:38 PM, pradip kumar Sil <pradipsil@gmail.com> wrote:

Dear Sir,

Thanks in advance.

As per my understanding :

 We will do buttering the P-91 pipe around 5 mm with PRE HEAT + POST HEAT +PWHT by  filler wire ERNiCr-3. Afterwards fit-up will be done with SS pipe & continue welding without preheating +postheating +pwht.

Correct me if i am wrong.

Regards,

On Mon, Feb 8, 2016 at 6:11 PM, <dilintas@gmail.com> wrote:

If your Code is ASME you need to PWHT whatever the thickness is. So the best practice is to do buttering and then PWHT. Once PWHT completed you weld to 316. 

The thickness of the buttering should be such that the haz of the second weld does not fall on P91. I would suggest 5 mm

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From: pradip kumar Sil Sent: Δευτέρα, 8 Φεβρουαρίου 2016 - 14:56 To: materials-welding Reply To: materials-welding@googlegroups.com Subject: [MW:24251] P-91 to SS Welding

Dear Expert,

We have to weld P-91 Material to 316 (SS) material with ERNiCr-3 filler Wire Socket Weld.

My question is needs to do buttering  the P-91 material if required how much layer we Need ?

During  & After buttering needs to conduct preheating & Post heating ?

During & after welding socket weld  only P-91 side or both side  we will conduct preheating +post heating + PWHT

Thanks in advance.

Regards

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