PWHT and RT

[Sagar QC]

Hi,

I have a doubt regarding PWHT and RT. We are welding P1 Material Pipes which has thickness more than 19mm so we are performing PWHT for the same. But my question is regarding when to take RT? Can we accept the joints which is radiographed before PWHT and  MPI after PWHT. Or will we have to perform the RT only after PWHT of the joints? Please advice me regarding this and provide the supporting clause.

Thanks and Regards,

Sagar.

[ahmed]

Hi Sagar,

 

As per ASME31.3, you will find PWHT before RT, But suggestion is to you follow your Project Specification or other wise Construction Code of your project.

Same issue came in our project also.

 

Regards,

Ahmed

 

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[Noushad cp]

Dear Sagar,

Asper B31.3 2007 Edn...No need of PWHT upto 20 mm thickness.

On 11/15/10, ahmed <ah...@costaindas.ae> wrote:
> Hi Sagar,
>
>
>
> As per ASME31.3, you will find PWHT before RT, But suggestion is to you
> follow your Project Specification or other wise Construction Code of your
> project.
>
> Same issue came in our project also.
>
>
>
> Regards,
>
> Ahmed
>
>
>
> _____
>

> From: material...@googlegroups.com
> [mailto:material...@googlegroups.com] On Behalf Of Sagar QC
> Sent: Monday, November 15, 2010 10:21 AM
> To: material...@googlegroups.com
> Subject: [MW:8267] PWHT and RT
>
>
>
> Hi,
>
>
>
> I have a doubt regarding PWHT and RT. We are welding P1 Material Pipes which
> has thickness more than 19mm so we are performing PWHT for the same. But my
> question is regarding when to take RT? Can we accept the joints which is
> radiographed before PWHT and MPI after PWHT. Or will we have to perform the
> RT only after PWHT of the joints? Please advice me regarding this and
> provide the supporting clause.
>
>
>
> Thanks and Regards,
>
> Sagar.
>
> --

> To post to this group, send email to material...@googlegroups.com

> To unsubscribe from this group, send email to
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> For more options, visit this group's bolg at
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> The views expressed/exchnaged in this group are members personel views and
> meant for educational purposes only, Users must take their own decisions
> w.r.t. applicable code/standard/contract documents.
>

> --
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[mahendra reddy]

Dear Sager

Before is our internal to sure that joint is ok to avoid the 2 times PWHT. After PWHT RT+ mpi is the one which is recordable. if u dont want u can avoid before pwht RT if u r sure that ur welders are perfect there will be no repairs.

THX & RGDS
M.M.REDDY
QA/QC INSPECTOR (WELDING / PIPING)
GAS TO LIQUID PROJECT
ESCRAVOS - NIGERIA
+2347054163177

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[César Alexis Viteri Pérez]

Dear Sagar,
 
Cracks are also related to termal contraction of high thickness pipe, personally I've seen cracks 48 h after welding and 24 h after RT. I suggest you perform RT before and after PWHT.
RT Before PWHT, because repair a high thickness joint take a lot of time if the defect is not near to the surface, and after repair you have to do PWHT.
RT After PWHT, becasue some times cracks appears after RT and B31.3 indicates so.
 
Regards
 
 
 
> Date: Mon, 15 Nov 2010 12:52:15 +0300
> Subject: Re: [MW:8274] RE: 8267] PWHT and RT
> From: ncp...@gmail.com
> To: material...@googlegroups.com

[Shadab Alam Ansari]

Dear All,
Can any one define how to go for continuity of the welders?
What are the criteria for continuity other than 6months qualification.
If a welder is qualified in SMAW process for Both Groove welding and CRO
and his qualification date has exceeded 2 years and he is continuously
welding for Groove welding but for more than he has not done overlay
welding. Is he qualified for Weld Overlay?

Thanking you,
Best regards,

Shadab

[Karthik]

Hi, No.Welder need requalification for Overlay welding.welder shall be requalified for each 6 months of each welding process.If he has not do welding in 6 months on any qualified process his qualification will be discontinued on the particular process. Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Mon, 11/15/10, Shadab Alam Ansari <ans...@ghi.com.sa> wrote:

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[mahendran p]

As per B31.3, it is not necessary to do the RT for P1 material after PWHT.   Regards, P.Mahendran --- On Mon, 15/11/10, mahendra reddy <mahend...@gmail.com> wrote:

[STR]

Whats the code of construction. as per ASME B31.3 NDT to be carried out after PWHT only

 

 

On Mon, Nov 15, 2010 at 11:50 AM, Sagar QC <sagarqcw...@gmail.com> wrote:

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Regards,

S.Tulasi Ramu
+971 50 8175303 ( Abudhabi), +91 9866998074(India).

[M.Shankar]

Hi Mr.Sagar

This case always depends on application.

The election between PWHT + NDT or NDT+PWHT+NDT is a decision to take according to the criticality of service, the specific experience of welding workshop, welders skill, time schedule, costs, etc.

About PWHT:

• PWHT does not always have a positive effect and can cause distortion and degradation of the microstructure.
• PWHT can “open up” indications (due to heat cycle) that might not show by NDT before PWHT.
• There is a chance for delayed cracking or post heat treatment cracking may happen in or adjacent to welds after PWHT.

Considering the above reasons NDT is preferable after PWHT to make sure the weld quality.

NDT + PWHT + NDT:

"RT before PWHT" would be an optional additional examination. Some folks do this do make sure the joint will pass RT prior to doing the PWHT. In some cases, if "RT before PWHT " is a requirement, it may be included in purchase order/specification.

If you noticed repair after PWHT, then you need repair and  re-PWHT required;to minimise/avoid this situation, preferable choice is NDT+PWHT+NDT. Repair work with re-PWHT may affect time schedule and cost impact also.

Customers always interested in NDT acceptance after PWHT.

PWHT + NDT:

However, have found that some contractors will tend to pay more attention to detail if they only shoot one RT after PWHT. Nobody wants to have to repair and perform a second PWHT.

 

Rgds/Shankar

---

From: Sagar QC <sagarqcw...@gmail.com>
To: material...@googlegroups.com
Sent: Mon, 15 November, 2010 2:20:45 PM

Subject: [MW:8267] PWHT and RT

--

[G Padmanabhan]

Dear Sagar,
As ASME/ANSI B31.3 2007 Edition,Thickness greater than 20mm only PWHT required.NDT before or after PWHT depends upon your project specificaiton. ASME B31.3 silent on ndt before or after pwht for P1 materials.

General good industrial practice is NDT after PWHT prefered.

On Mon, Nov 15, 2010 at 11:50 AM, Sagar QC <sagarqcw...@gmail.com> wrote:

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With Warm regards,

G.Padmanabhan
+96895685853

[Rajakrishnakanth, SA]

Hi,
Any body has experience of Super duplex SS -UNS S32750 cladding with SS
304(base material) using explosion bonding .What is the recommended practice
of stress relieving temperature& soaking time.

Thanks & Regards
S.A.Rajakrishnakanth

-----Original Message-----
From: material...@googlegroups.com on behalf of G Padmanabhan
Sent: Sat 11/20/2010 6:24 PM
To: material...@googlegroups.com
Subject: Re: [MW:8336] PWHT and RT

Dear Sagar,
As ASME/ANSI B31.3 2007 Edition,Thickness greater than 20mm only PWHT
required.NDT before or after PWHT depends upon your project specificaiton.
ASME B31.3 silent on ndt before or after pwht for P1 materials.

General good industrial practice is NDT after PWHT prefered.

On Mon, Nov 15, 2010 at 11:50 AM, Sagar QC <sagarqcw...@gmail.com>wrote:

> Hi,
>
> I have a doubt regarding PWHT and RT. We are welding P1 Material Pipes
> which has thickness more than 19mm so we are performing PWHT for the same.
> But my question is regarding when to take RT? Can we accept the joints
which
> is radiographed before PWHT and MPI after PWHT. Or will we have to perform
> the RT only after PWHT of the joints? Please advice me regarding this and
> provide the supporting clause.
>
> Thanks and Regards,
> Sagar.
>
> --
> To post to this group, send email to material...@googlegroups.com
> To unsubscribe from this group, send email to
>

materials-weld...@googlegroups.com<materials-welding%2Bunsubscrib
e...@googlegroups.com>

> For more options, visit this group's bolg at
> http://materials-welding.blogspot.com/
> The views expressed/exchnaged in this group are members personel views and
> meant for educational purposes only, Users must take their own decisions
> w.r.t. applicable code/standard/contract documents.
>

--
With Warm regards,

G.Padmanabhan
+96895685853

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[M.Shankar]

Hi Mr.Sagar

For asking support clause, please refer below:

Based on below as per B31.3, P1 material not required NDE after completion of Heat treatment and this point not mentioned in code legibly; but mentioned in interpretation 19-15 (refer attachment)

 

a)    (a) Refer Para 341.3.1(a)

             “For P-Nos. 3, 4, and 5 materials, examination shall be performed after completion of any heat treatment”

 

b)    (b) Refer Note (11) in “NOTES FOR APPENDIX A TABLES “

“For use under this Code, radiography shall be performed after heat treatment”

             This note(11) pointing P3, P4, P5A, P5B, P9A & P9B materials only as per table A-1.

c)    (c) Refer B31.3 interpretation 19-15, Question(2)  (refer attachment)

 

“P1 or P2 materials not required NDE after final Heat treatment”

 

Rgds/Shankar

---

From: M.Shankar <mails_...@yahoo.co.in>
To: material...@googlegroups.com
Sent: Wed, 17 November, 2010 7:14:24 PM
Subject: Re: [MW:8306] PWHT and RT

Hi Mr.Sagar

[Subin Das]

Hai sagar,

BSR is Not Necessary, if there is client requirement you have to take BSR otherwise you can pass the joint by taking ASR

[pradip kumar Sil]

Pls check  ASME B-31.1 clause No 136.4.1 

Before PWHT Radiography is not required , Pls check client specification

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[Aby Jose]

Dear sagar,

First of all According to ASME B31.3 2014 edition PWHT is not required for P1 material for thickness greater than 25mm if you are doing a preheat of 95 degree or multiple layer welds are used when thickness greater than 5mm.

Secondly for your question ; RT should be done compulsarily after PWHT. Normally RT is done both before and after PWHT . RT before PWHT is done to assure the weld joints are defect free before PWHT. 

Regards,

Aby

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