After Stabilize Heat treatment of 347H weld material Linear indication observed

[Jenish MISTRY]

Dear seniors ,

As stated subject ,We are facing linear indication on weldolet to Pipe joint  after stabilize Heat treatment.

Pipe & Weldolet material : A 358  347H CL1 & SA 182 F 347H

Pipe & weldolet Size : 20" Sch. 120

Heat treatment Cycle : Soaking temperature : 886 - 905 ( Soaking time : 3 Hr. & 15 min. minimum)

Welding consumable : ER 347 with carbon greater than & equal to 0.04%.

Please give your inputs to eliminate linear indication. 

[Raghuram Bathula]

What kind of indication?

Could you Please share before and after HT photographs

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[Jenish Mistry]

Hi sir,

Please refer attached Photograph.

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CADxVubkSU0%2Bcv%2B9OrpR7yRBcX-Aw3ERFwcGykPuB-9hW3p5VuQ%40mail.gmail.com.

[Kannayeram Gnanapandithan]

bead should be lightly Convex 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CADXbd_eHzr46UvTwVA7LOqjSrHjRh6ZJqAgH7B9qTV7sdUGamQ%40mail.gmail.com.

[Jenish Mistry]

Hi sir ,

Thanks for your reply.

We already take action against your reply but is there any other factor which may lead to this kind of defect.

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAJzm4eM9hSVEaFZ1%2BfEPAF5YZ7R5coTc5gQCysL09WG%3D_8mm3A%40mail.gmail.com.

[P Goswami]

Hi Jenish,

Typically, any weldolet welding involves, high volume of weld metal and high residual stress.  SS 347H is prone to “Stress Relaxation Cracking” if the welding parameters, weld ferrite,  welding consumable chemistry (C:Nb ratio)is not controlled & more..

 

Do a detailed inspection for the root cause. If the indications are due to common welding technique related, such as “LOF”, then the solutions are easy. If these are cracks after Stabilizing HT then the above mentioned cracking is one of the root cause/s. One has to carefully grind and weld repair. Smaller areas may be repaired by “Controlled Deposition Technique”.

 

You may find more resources in API -TR-942B.

 

Thanks.

 

 

Pradip Goswami.P.Eng, IWE.

Consulting Welding & Metallurgical Engineering Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

 

From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of Jenish Mistry
Sent: Thursday, December 28, 2023 1:59 AM
To: material...@googlegroups.com
Subject: Re: [MW:34716] After Stabilize Heat treatment of 347H weld material Linear indication observed

 

Hi sir ,

 

Thanks for your reply.

 

We already take action against your reply but is there any other factor which may lead to this kind of defect.

 

On Wed, Dec 27, 2023 at 7:48 PM Kannayeram Gnanapandithan <kgpan...@gmail.com> wrote:

bead should be lightly Convex 

 

On Tue, Dec 26, 2023, 11:26 AM Jenish Mistry <jenishmi...@gmail.com> wrote:

Hi sir,

 

Please refer attached Photograph.

 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CADXbd_e61EMw32u6xMx17bKxmr_UwA5vxQjHHDg75OKB__L4pg%40mail.gmail.com.

Virus-free.www.avg.com

[P Goswami]

 

Hi Jenish,

Typically, any weldolet welding involves, high volume of weld metal and high residual stress.  SS 347H is prone to “Stress Relaxation Cracking” if the welding parameters, weld ferrite,  welding consumable chemistry (C:Nb ratio)is not controlled & more..

 

Do a detailed inspection for the root cause. If the indications are due to common welding technique related, such as “LOF”, then the solutions are easy. If these are cracks after Stabilizing HT then the above mentioned cracking is one of the root cause/s. One has to carefully grind and weld repair. Smaller areas may be repaired by “Controlled Deposition Technique”.

 

You may find more resources in API -TR-942B.

 

Thanks.

 

 

Pradip Goswami.P.Eng, IWE.

Consulting Welding & Metallurgical Engineering Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

 

From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of Jenish Mistry
Sent: Thursday, December 28, 2023 1:59 AM
To: material...@googlegroups.com
Subject: Re: [MW:34716] After Stabilize Heat treatment of 347H weld material Linear indication observed

 

Hi sir ,

 

Thanks for your reply.

 

We already take action against your reply but is there any other factor which may lead to this kind of defect.

On Wed, Dec 27, 2023 at 7:48 PM Kannayeram Gnanapandithan <kgpan...@gmail.com> wrote:

bead should be lightly Convex 

 

On Tue, Dec 26, 2023, 11:26 AM Jenish Mistry <jenishmi...@gmail.com> wrote:

Hi sir,

 

Please refer attached Photograph.

 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CADXbd_e61EMw32u6xMx17bKxmr_UwA5vxQjHHDg75OKB__L4pg%40mail.gmail.com.

Virus-free.www.avg.com

[Jenish Mistry]

Dear sir ,

Thanks for your inputs.

For your information, We have already done repair as mentioned you above (with Control parameter & with Convex weld Bead to avoid stress concentration) & perform LPWHT (Stabilize Heat treatment ) with control cooling but this time indication come from old weld metal (where indication not observed after first PWHT).What is factor affecting this ?

Is there any effect on material Properties (SA 358 Cl.1 /SA 182 F 347H) after multiple heat treatment ( Stabilize Heat Treatment)? if so,than how do we ensure effect after multiple Heat treatment ?

Can you please forward API -TR-942B if you have ??

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