Re: [MW:24308] P-91 to SS Welding

Why u chosen 316 for this service temp?    Dissimilar welds made with SS filler will lead to failure at P91HAZ even at temp below the creep range due to 1. Differences of co efficient of expansion between them leading to the formation of large tempered induced stresses at the weld interface. 2. Carbon diffusion from the csef to Ass at the weld interface reduces creep strength of the csef so that creep voids develop and failure occurs by creep along csef alloy. So it is better to use Nickel base fillers.

On 16-Feb-2016 3:17 pm, "pradip kumar Sil" <pradipsil@gmail.com> wrote:

Which is the best practice

1. Preheat P-91 Side, buttering by ERNiCr-3  4 to 5 mm & after Post heat & pwht same as P-91 Material. After conduct fit up with SS material & continue welding without Preheating +Postheating & PWHT. 

2.Preheat and pwht shall be done such that P91 side shall be covered fully and HAZ of ss to be covered.

Regards,

On Tue, Feb 16, 2016 at 1:32 PM, Ramdoss Ravindiren <rdoss1986@gmail.com> wrote:

in my experience, use of inconel eletrode is best. Preheat and pwht shall be done such that P91 side shall be covered fully and HAZ of ss to be covered. Sensitization      can be avoided.

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From: Kannayeram Gnanapandithan
Sent: ‎16-‎02-‎2016 12:13 PM
To: materials-welding
Subject: Re: [MW:24304] P-91 to SS Welding

buttering is the best one and buttering thickness should not be less than 5mm . we have done both method, for less thickness  direct welding and more than 10mm thickness we have done buttering. pl check the feasibility and do it . 

in ur case, do preheat , butter and do pwht after that weld with only With Nickel base fillers

THANKS & BEST REGARDS,

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

CONSULTANT-WELDING & QUALITY

On Tue, Feb 16, 2016 at 9:26 AM, pradip kumar Sil <pradipsil@gmail.com> wrote:

Inside the HRSG temp is 550 degree centigrade so we choose ERNiCr-3

On Tue, Feb 16, 2016 at 8:29 AM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

it is not advisable to use 309 because 309 weld metal  may not be  suitable for service/pwht  temp above 370 C 

THANKS & BEST REGARDS,

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

CONSULTANT-WELDING & QUALITY

On Mon, Feb 15, 2016 at 4:18 PM, George Dilintas <dilintas@gmail.com> wrote:

the final welding is better to do with grade 309 filler metal (in order to avoid low FN and thus hot cracking)

2016-02-11 11:08 GMT+02:00 pradip kumar Sil <pradipsil@gmail.com>:

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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