Materials & Welding: August 2012

Friday, August 31, 2012

Re: [MW:15176] Defects in the MIG welding of F91+F91 -reg

It is not a matter of shielding gas. Try to keep the arc shorter (lower volts) and remove the torch very slowly
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

From: Sankaran Sp [subasankaran@yahoo.co.in]
Sent: 31/08/2012 18:03 ZE8
To: materials-welding@googlegroups.com
Subject: [MW:15173] Defects in the MIG welding of F91+F91 -reg

Dear friends,

I am working the leading valve manufacturing company in Coimbatore ( INDIA) i ma facing quality issue in the MIG welding of Er 90S-B9.
We have product in ASTM A182- F91 forged steel valve ( Equivalent to C12A casting or P91 pipes),during welding of body+Bonnet we are facing the crack in the crater area.
Our welding parameters are as below:
Joint type = Circumferential Fillet welding, Current = 215 - 235 Amps, V = 25 - 27 Volts, Shielding Gas = Ar+CO2 ( 80+20 % mixture), Gas flow = 20 - 25 LPM, Pre heat temp = 210 - 230 Deg C, Inter pass temp= 320 - 380 Deg C
>After welding ,the joint was inspected by M.P test andcrack found on crater area.
> Removed the welding by turning, then re- test carried out with increased
the post flow timings of shielding gas, but no improvement in the test, same
crack appeared on crater area.

What will be the reason for this defect? Can you suggest me suitable method
to over come this problem?
What will be the reason for this crack?
Kindly send your recommendations to solve this issue.

Advance thanks and regards,
Sankaran.SP

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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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RE: [MW:15175] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Good morning sir,

Requested to send mail in advance at least week time . I am interested for the same.

Regards,

RK Vichare

(M)9869679123

----- Original Message -----
From: Mistry K.U (Mumbai - Construction)
To: materials-welding@googlegroups.com
Sent: Fri, 31 Aug 2012 14:26:23 +0530 (IST)
Subject: RE: [MW:15172] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Too late info - please arrange such info in little advance please.

K. U. Mistry

Manager QA/QC

Tecnimont ICB Pvt Ltd

LLDPE/HDPE (SWING) Project

OPAL Dahej Off Shore Project Site Gujarat

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
On Behalf Of prem nautiyal

Sent: 31 August 2012 11:48

To: materials-welding@googlegroups.com

Subject: [MW:15170] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Dear All,

Indian Institute of Welding, Mumbai branch cordially invites you for a technical lecture on

"Welding Requirements for Offshore Oil & Gas Projects"

By Mr. Maruti Kumar, AEE(E) / Mr. D. Badole, CE(M) / Mr Pradeep N. Nair, CE(E) From :QA
& Vendor Cell, Offshore Engineering Services, ONGC, Mumbai, India.

On Friday, 31-08-2012 at 6.15 pm

At

Avion Hotel,

Domestic Airport, Nehru Road, Vile Parle (East), Mumbai - 400 057, India.

Mumbai Branch Tel No : (022) 25772637

Tel: (022) 25772637

Refer attached file for more details.

Regards,

Prem Nautiyal

The Indian Institute Of Welding

Mumbai Branch

Cell: 9769316004

www.iiwindia.com

Re: [MW:15174] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Is there any program in gulf? Please update.

Regards,

Syed Mazhar Ali

From: prem nautiyal <prem_nautiyal26@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 30 August 2012, 20:11
Subject: [MW:15170] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Dear All,

Indian Institute of Welding, Mumbai branch cordially invites you for a technical lecture on

"Welding Requirements for Offshore Oil & Gas Projects"
By Mr. Maruti Kumar, AEE(E) / Mr. D. Badole, CE(M) / Mr Pradeep N. Nair, CE(E) From :QA & Vendor Cell, Offshore Engineering Services, ONGC, Mumbai, India.
On Friday, 31-08-2012 at 6.15 pm

At
Avion Hotel,
Domestic Airport, Nehru Road, Vile Parle (East), Mumbai - 400 057, India.
Mumbai Branch Tel No : (022) 25772637
Tel: (022) 25772637
Refer attached file for more details.

Regards,

Prem Nautiyal

The Indian Institute Of Welding

Mumbai Branch

Cell: 9769316004

www.iiwindia.com

[MW:15173] Defects in the MIG welding of F91+F91 -reg

RE: [MW:15172] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Too late info - please arrange such info in little advance please.

K. U. Mistry

Manager QA/QC

Tecnimont ICB Pvt Ltd

LLDPE/HDPE (SWING) Project

OPAL Dahej Off Shore Project Site Gujarat

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of prem nautiyal
Sent: 31 August 2012 11:48
To: materials-welding@googlegroups.com
Subject: [MW:15170] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Dear All,

Indian Institute of Welding, Mumbai branch cordially invites you for a technical lecture on

“Welding Requirements for Offshore Oil & Gas Projects”

By Mr. Maruti Kumar, AEE(E) / Mr. D. Badole, CE(M) / Mr Pradeep N. Nair, CE(E) From :QA & Vendor Cell, Offshore Engineering Services, ONGC, Mumbai, India.

On Friday, 31-08-2012 at 6.15 pm

At

Avion Hotel,

Domestic Airport, Nehru Road, Vile Parle (East), Mumbai - 400 057, India.

Mumbai Branch Tel No : (022) 25772637

Tel: (022) 25772637

Refer attached file for more details.

Regards,

Prem Nautiyal

The Indian Institute Of Welding

Mumbai Branch

Cell: 9769316004

www.iiwindia.com

Re: [MW:15171] Problem about Positive material Identification(PMI)

Mr. Jubir

Whether PMI was done before PWHT or after PWHT?

If results are from before PWHT, then there is something wrong in fillter metal, might be wrong fillter used.

If PMI done after PWHT, then you can weld sample joints again, and do PMI before and after PWHT and analyse the results.

Alternatively, you can try with other PMI isntruments, even you can go for Lab chemical analysis of few joints to ascertain some conclusion.

Thanks

Murugesan

On Fri, Aug 31, 2012 at 12:19 AM, c sridhar <sridhar305@yahoo.com> wrote:

Mr. Jubir,

Noted the points mentioned by you. If the filler materials were pre checked and found to be OK for its chemistry, then there can not be any reason for such a drastic change in the post weld chemistry, i.e., from 9% to 4%.

The pre, inter pass, post heat or PWHT temp. as mentioned by you are all within the stipulated range and can not be a reason either.

All the 800 joints can not go wrong at a time unless something happened drastically. Have a random check (date wise fabrication) again and find if the Cr. deficiency is same with all the joints. It may give an insight and may lead to a conclusion.

regards,

Sridhar.

From: mohamed jubair <kmd.jubair@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 30 August 2012 1:49 PM
Subject: Re: [MW:15164] Problem about Positive material Identification(PMI)

Dear Mr. Sridhar

Thanks for your suggestion.

Please understand my point. The filler wire readings mentioned in the table(trailing mail) is not from the manufacture's test certificate but from Positive material identification(PMI). In PMI test two parent metals,filler wire showing positive values as T91 but weld metal only not conforming as T91.

We procured other two new batch filler wires from the same manufacturer,welded and checked. It shows positive material for all the four(two parent metal,weld metal,filler wire) as T91.

Regards

Jubair

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm

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.

Thursday, August 30, 2012

[MW:15170] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Dear All,

Indian Institute of Welding, Mumbai branch cordially invites you for a technical lecture on

"Welding Requirements for Offshore Oil & Gas Projects"
By Mr. Maruti Kumar, AEE(E) / Mr. D. Badole, CE(M) / Mr Pradeep N. Nair, CE(E) From :QA & Vendor Cell, Offshore Engineering Services, ONGC, Mumbai, India.
On Friday, 31-08-2012 at 6.15 pm

At
Avion Hotel,
Domestic Airport, Nehru Road, Vile Parle (East), Mumbai - 400 057, India.
Mumbai Branch Tel No : (022) 25772637
Tel: (022) 25772637
Refer attached file for more details.

Regards,

Prem Nautiyal

The Indian Institute Of Welding

Mumbai Branch

Cell: 9769316004

www.iiwindia.com

Re: [MW:15169] Problem about Positive material Identification(PMI)

Mr. Jubir,

Noted the points mentioned by you. If the filler materials were pre checked and found to be OK for its chemistry, then there can not be any reason for such a drastic change in the post weld chemistry, i.e., from 9% to 4%.

The pre, inter pass, post heat or PWHT temp. as mentioned by you are all within the stipulated range and can not be a reason either.

All the 800 joints can not go wrong at a time unless something happened drastically. Have a random check (date wise fabrication) again and find if the Cr. deficiency is same with all the joints. It may give an insight and may lead to a conclusion.

regards,

Sridhar.

From: mohamed jubair <kmd.jubair@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 30 August 2012 1:49 PM
Subject: Re: [MW:15164] Problem about Positive material Identification(PMI)

Dear Mr. Sridhar

Thanks for your suggestion.

Please understand my point. The filler wire readings mentioned in the table(trailing mail) is not from the manufacture's test certificate but from Positive material identification(PMI). In PMI test two parent metals,filler wire showing positive values as T91 but weld metal only not conforming as T91.

We procured other two new batch filler wires from the same manufacturer,welded and checked. It shows positive material for all the four(two parent metal,weld metal,filler wire) as T91.

Regards

Jubair

Re: [MW:15168] RE: 15142] Problem about Positive material Identification(PMI)

I request all our group members not to mention any consumable manufacturer's trade name in their queries.

This forum has to be STRICTLY used for exchange of technical information related to Welding, materials & NDT and not make a mockery of any company or do sales publicity across the globe for others. It takes years of hard work to earn reputation in the market and few seconds to lose the same. We are not here to cause harm to the reputation of any local Indian company and publicise international brands.

I hope you guys will cooperate and make the best use of this forum in a professional manner.

Regards

Prem Nautiyal

Cell: 9769316004

The Indian Institute Of Welding

Mumbai, India

--- On Wed, 8/29/12, Shankar gmail <shankarn6@gmail.com> wrote:

From: Shankar gmail <shankarn6@gmail.com>
Subject: Re: [MW:15151] RE: 15142] Problem about Positive material Identification(PMI)
To: materials-welding@googlegroups.com
Date: Wednesday, August 29, 2012, 8:42 AM

Dear Mr.Jubair,

I feel you have got 5Cr 1Mo wire from the supplier whereas they have produced 9Cr1Mo V TC. it is not possible that the filler material chemistry and weld metal chemistry can change like this.

You have no other option but to cut and re-weld. I would suggest that ban the supplier and be vigilant while procuring the consumables.

When you have trusted suppliers for this P91 alloy with long term reputation are in the market there is no need for you to venture with D&H. As such P91 is a critical alloy to deal with ( a lot of attention is required at every stage right from selection of consumables till proper PWHT) and the application is also critical any negligence on this could be disastrous.

regards,

shankar

On Wed, Aug 29, 2012 at 4:48 AM, John Henning <jhenning@deltak.com> wrote:

You clearly have the wrong filler metal – you are out of spec for Cr, V, and Nb. This filler metal will have far lower creep strength than the proper 91 chemistry filler metal. You need to remove any weld found with this type chemistry and re-weld with proper filler metal. If this filler metal is mismarked, you need to eliminate the supplier from your approved list. This is a major problem and could have disastrous consequences if it makes it out into the field.

John A. Henning

Welding & Materials

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mohamed jubair
Sent: Tuesday, August 28, 2012 3:25 AM
To: materials-welding@googlegroups.com
Subject: [MW:15142] Problem about Positive material Identification(PMI)

Dear all,

In our boiler one major problem occurred in Positive Material Identification(PMI) test [Spectrum test].

Description	Reheater finishing outlet(RHFO) coil
Material	T91
Size	ø 63 x 4
Process	GTAW only
Filler wire	ER 90S B9
Filler wire Manufacturer	D & H Secheron
Preheating °C	185
Rate of Heating °C	100/hr
Interpass temp °C	190
Post heating °C	100
PWHT °C	750
Soaking Time	90 minutes

Around 800 joints welded in the above approved procedure only. Filler wire, header stub, RHFO coil, weld metal undergone PMI test separately and all show positive material results as T91 except weld metal. Weld metal shows the Chromium content only as (4-7%){Reqd is 8-10.5%}. We can't find how it happened? Our Chinese consultant told to cut and reweld all the joints. But our contractor argued that we followed approved procedure and used approved vendor's consumable only. Please give a solution. Here I have attached one preheating cum PWHT chart of RHFO joints(for 11 joints,5 thermocouples,1 recorder).All 800 joints are not checked yet. Only 40 joints checked and all 40 weld metals shown low Cr Content.

Please go through the below readings of one RHFO joint.

Description	Filler wire	Header stub	Weld metal	RHFO coil
Alloy	T91	T91	A-2	T91
Cr	8.94	8.34	5.19	8.68
Mo	0.96	0.90	0.93	0.92
V	0.17	0.17	0.08	0.19
Ti	0.07	0.10	0.04	0.03
Mn	0.60	0.40	0.54	0.63
Fe	87.81	88.11	90.86	87.61
Ni	0.12	0.33	0.20	0.38
Cu	0.02	0.16	0.20	0.16
Nb	0.09	0.08	0.03	0.04
W	0.15		0.00

Waiting for your valuable suggestions.

Thanks & Regards

K Mohamed Jubair

--
Shankar
9994562774

Materials & Welding

Friday, August 31, 2012

Re: [MW:15176] Defects in the MIG welding of F91+F91 -reg

RE: [MW:15175] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Re: [MW:15174] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

[MW:15173] Defects in the MIG welding of F91+F91 -reg

RE: [MW:15172] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Re: [MW:15171] Problem about Positive material Identification(PMI)

Thursday, August 30, 2012

[MW:15170] Invitation to IIW Monthly Technical Lecture_31st Aug 2012 @ Mumbai, India

Re: [MW:15169] Problem about Positive material Identification(PMI)

Re: [MW:15168] RE: 15142] Problem about Positive material Identification(PMI)

[MW:35346] Cast-iron welding

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