Re: [MW:24267] P-91 to SS Welding

Depending on the type of heat treatment you intend to do. But the truth is that for this dissimilar material, there is no heat treat you will do without destroying one of the materials.

The heat treatment recommended for P91 will have an adverse effect on the metallurgy of the SS and perculiarity is depended upon the type of SS and also the heat treatment recommended for SS will also have an adverse effect on the P91 material. There is lot of write up on this topic in this group and it can no longer be over flogged. The answer given earlier is the best practice.

Regards.

Rems

On 11 Feb 2016 12:43, "pradip kumar Sil" <pradipsil@gmail.com> wrote:

If we do PWHT on SS side, will it effect any metallurgical problem.

On Thu, Feb 11, 2016 at 4:35 PM, pradip kumar Sil <pradipsil@gmail.com> wrote:

Thanks

On Thu, Feb 11, 2016 at 4:33 PM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

do preheat only for P91 and carry out PWHT for both

THANKS & BEST REGARDS,

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

CONSULTANT-WELDING & QUALITY

On Thu, Feb 11, 2016 at 4:54 PM, pradip kumar Sil <pradipsil@gmail.com> wrote:

 My question is both side of weldment we will do preheat & pwht ( i.e  Stainless steel side & P-91 Side )

On Thu, Feb 11, 2016 at 3:14 PM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

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

Sent from my BlackBerry 10 smartphone.

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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