PT after root pass in SS welding

[Mohamed Mubarak Syed]

Recently I faced the following issue and kindly clarify my doubt.
A qualified WPS for stainless steel (A312-TP304H) requires PT after root pass.
After root pass, its not possible to perform PT immediately unless the temperature reduces.
But, in normal practice,any weld is not to be stopped before completing hot pass or 1/3rd of groove thickness.
I got difficulty in following both conditions on single weld joint.

Based on the above different opinions, kindly suggest me the right one with details.

[Vishal Mehta]

Hi,

There are PT pdts available for high temp...i GUESS at around 260 deg C

Best Regards

Vishal Mehta


Supertech Services Ltd.
Plot No A-253, Road No 30-B,
Wagle Indl Estate,
Thane 400 604.

Sent from my Nokia Wireless Device

[mohan q8]

Hi Syed,

You can carryout the DP on the root pass before hot pass, As per Sec-IX  time between root and hot pass is not an essential veritable but in API 1104 time between passes is an essential veritable. so You can proceed DP test after root pass when weld temp comes below 50deg C since as you know that DP test can be done from 10 to 55 deg C. The requirement of hot pass and 1/3 thickness is only applicable when you are suspending the welding activity.

Furthermore you can prepare seperate WPS with DP test after root pass for particullar joints (ex- Tie in's).

On Sun, Oct 25, 2009 at 5:10 PM, Vishal Mehta <v...@supertechservices.in> wrote:

Hi ,

--
With Regards,

Mohan, Q8.

[PREM SHANKARDUTT NAUTIYAL]

Hello Syed

You can very well conduct PT after Root pass while welding SS, only ensure that temp. has come below 52 degreeC.
We regularly conduct PT after root pass when welding SS jobs even upto 70mm thick with GTAW.

The chances of cracking after GTAW root pass is seen in thick sections of CS and LAS material i.e above 20/25mm thick OR having high restraints. Hence while welding such materials,we conduct PT after hot pass only.
For thin sections LPT can be done safely after root pass for CS/LAS material.
This is only my experience which i would like to share with you!!

Regards

Prem Nautiyal
Godrej, Mumbai
Cell:9820313278

On Sun, 25 Oct 2009 17:12:07 +0530 wrote

>Recently I faced the following issue and kindly clarify my doubt. A qualified WPS for stainless steel (A312-TP304H) requires PT after root pass. After root pass, its not possible to perform PT immediately unless the temperature reduces.
But, in normal practice,any weld is not to be stopped before completing hot pass or 1/3rd of groove thickness. I got difficulty in following both conditions on single weld joint.
Based on the above different opinions, kindly suggest me the right one with details.

PREM S NAUTIYAL
CELL : 9820313278

[Gopalasamy, Ramasamy - PY1 Site]

Dear all,

Maintaining interpass temperature is up to the WPS preparing authority. You can stop very well at root pass, cool down and carry on PT. This shall be established in WPS / PQR enabling to follow the same during production welding.

 

Regards,

 

R.Gopalasamy,

Sr.QA/QC Consultant,

Hindustan Oil Exploration Company Ltd,

PY1, Onshore Gas Processing Facility,

Thirukkadaiyur.

email : rgopalasamy @hoec.com

Mobile : 09789090752

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From: material...@googlegroups.com on behalf of PREM SHANKARDUTT NAUTIYAL
Sent: Mon 10/26/2009 7:40 PM
To: smmub...@gmail.com
Cc: material...@googlegroups.com
Subject: [MW:3547] Re: PT after root pass in SS welding

[PREM SHANKARDUTT NAUTIYAL]

Dear Mr.Devang Naik

What is meant by hot MT ?
Is it possible for Austenitic Stainless Steels ?

Regards

Prem Nautiyal
Godrej,Mumbai
Cell:9820313278

On Tue, 27 Oct 2009 20:49:24 +0530 wrote
>Dear Mr. Syed and Mr. Prem
>

>
You may go for hot MT after root pass.
>

>
Thanks
>

>
Devang Naik
>

>
On Tue, 27 Oct 2009 11:22:17 +0530 wrote