Materials & Welding: December 2013

Tuesday, December 31, 2013

Re: [MW:19734] DIFFERENCE BETWEEN ER70S-2 &ER70S-6

ER70S-2 is compatible GTAW wire to be use with Ar gas only. Where as -6 is compatible GMAW wire generally use with CO2 GAS. Si n Mn has to add as deoxifizers to eliminate effect of O2 from weld pool.

Regards,
Maulik
Welding engg. And metallurgy
Larsen n toubro
Surat

On Nov 26, 2012 3:37 PM, "Vinu Raveendran" <vinuravi007@gmail.com> wrote:

Dear Members,

I would like to know difference between ER70S2 &ER70S6?
What does "2" and "6" mean in them and which welding process we use them?

Thankyou!

--
VINU RAVEENDRAN

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[MW:19735] standard WPS for SMAW Carbon Steel to Austenitic Stainless

Dear Experts
Hi
Is There any standard WPS for SMAW Carbon Steel to Austenitic Stainless according to EN ISO or AWS standards?
( st 37 to a304 , THK: 10mm , V Groove)

If yes do send me the document NO. .

Thank you

RE: [MW:19733] Duplex UNS 31803 - FCAW Shielding Gas

Hi Saravanan,

Mixed gases are always better options for FCAW of DSS than pure(100%) CO2 shielding. Please read through API-TR-938C, Clause 4.4 and other clauses for guidance. Also you may refer the attached link for guidance also. Some of the potential risks of 100% CO2 shielding are :-

poor toughness
higher hardness in the weld and HAZ
meeting corrosion test requirements.

Usually DSS is always chosen for demanding applications. Hence the welding consumables and the shielding gases have to be of "quality product".Or else failure in welding test or in service are inevitable.

If 100% CO2 shielding meets all of your project requirements, PQR qualification, radiographic consistency, lower weld defect rates then it's worth trying. Otherwise saving a few "bucks" here and there" may mean bigger headaches at the end. Usually for offshore projects and especially with DSS, clients are very specific. The proposal have to be backed up by the quality results/reports.

The recommendations of the consumable manufacturers mentioned below is worth considering, as the product formulation, testing and qualification are all by them through rigorous process/es.

Thanks.

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pgoswami@sympatico.ca

http://www.netlite.com.my/home/wp-content/uploads/2011/11/A126_A132.pdf

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Saravanan Sornam
Sent: Monday, December 30, 2013 6:45 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:19732] Duplex UNS 31803 - FCAW Shielding Gas

Dear Welding and Metallurgy Experts,

With ref. to the below mail ,

in most of the welding consumable manufacturer's recommendation like SandVik, Metrode, FCAW duplex filler for the material UNS 31803, to be done with Argon 75 to 80 % and rest by Co2 shielding gas for optimum results.

Are there any potential risks , corrosion problems Or SCC arises during process in Oil Gas, refineries and other plants, when we use FCAW with 100% Co2 shielding gas ?

Because we are going to propose to our client with 100% Co2 shielding gas for FCAW ( Duplex S31803 material ) , for Production Coolers of GAS development Project.

The fluid inside the header boxes are Hydrocarbon and its condition is Vapor & Liquid mixed.

If you have such records, please do share with me.

Regards,

Saravanan

Korea

On Mon, Dec 16, 2013 at 2:15 AM, c sridhar <sridhar305@yahoo.com> wrote:

Welding duplex material UNS 31803

TIG welding is usually performed with pure argon as the shielding gas. Resistance to, in particular, pitting corrosion can be considerably raised by the addition of up to 2% nitrogen. However, because the risk of pores increases with increased nitrogen content, the latter should not exceed 2%. The addition of around 30% helium markedly increases arc energy and thus enables a considerable increase (20–30%) in welding speed. In the welding of duplex steels, the addition of hydrogen is not to be recommended. In combination with the high ferrite content (over 70%), this can lead to hydrogen embrittlement. Single-sided root beads must be welded with a backing gas. This is normally the same as the shielding gas. A backing gas should also be used for tack welding all the way up until weld thickness is at least 8 mm.

FCAW is most suitably performed using argon with an addition of 16–25% carbon dioxide as the shielding gas. Welding with pure carbon dioxide is also possible, but arc stability and weld pool control are noticeably poorer. However, compared with a mixed gas, one advantage is that penetration is slightly better. Also compared with a mixed gas, the voltage should be increased by 2–3 volts when welding with pure carbon dioxide. This prevents the arc being too short.

Also enclosing filler wire details and hope it will of help to you.

sridhar

From: Saravanan Sornam <saravanshyla@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, 15 December 2013 4:21 PM
Subject: [MW:19600] Duplex UNS 31803 - FCAW Shielding Gas

Dear Welding Experts ,

Could you please share quite urgently that,

which shielding gas is best applicable for FCAW-GS for welding Duplex material grade UNS 31803 ( P No. 10H ) and why ?

Also, share the best Preheat method for high alloy steels to remove moisture and for high thk joint applications .

Awaiting for your reply.

Thanks and Regards,

Saravanan,

Korea.

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Re: [MW:19732] Duplex UNS 31803 - FCAW Shielding Gas

Dear Welding and Metallurgy Experts,

With ref. to the below mail ,

Are there any potential risks , corrosion problems Or SCC arises during process in Oil Gas, refineries and other plants, when we use FCAW with 100% Co2 shielding gas ?

Because we are going to propose to our client with 100% Co2 shielding gas for FCAW ( Duplex S31803 material ) , for Production Coolers of GAS development Project.

The fluid inside the header boxes are Hydrocarbon and its condition is Vapor & Liquid mixed.

If you have such records, please do share with me.

Regards,

Saravanan

Korea

On Mon, Dec 16, 2013 at 2:15 AM, c sridhar <sridhar305@yahoo.com> wrote:

Welding duplex material UNS 31803

TIG welding is usually performed with pure argon as the shielding gas. Resistance to, in particular, pitting corrosion can be considerably raised by the addition of up to 2% nitrogen. However, because the risk of pores increases with increased nitrogen content, the latter should not exceed 2%. The addition of around 30% helium markedly increases arc energy and thus enables a considerable increase (20–30%) in welding speed. In the welding of duplex steels, the addition of hydrogen is not to be recommended. In combination with the high ferrite content (over 70%), this can lead to hydrogen embrittlement. Single-sided root beads must be welded with a backing gas. This is normally the same as the shielding gas. A backing gas should also be used for tack welding all the way up until weld thickness is at least 8 mm.

FCAW is most suitably performed using argon with an addition of 16–25% carbon dioxide as the shielding gas. Welding with pure carbon dioxide is also possible, but arc stability and weld pool control are noticeably poorer. However, compared with a mixed gas, one advantage is that penetration is slightly better. Also compared with a mixed gas, the voltage should be increased by 2–3 volts when welding with pure carbon dioxide. This prevents the arc being too short.

Also enclosing filler wire details and hope it will of help to you.

sridhar

From: Saravanan Sornam <saravanshyla@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, 15 December 2013 4:21 PM
Subject: [MW:19600] Duplex UNS 31803 - FCAW Shielding Gas

Dear Welding Experts ,

Could you please share quite urgently that,

which shielding gas is best applicable for FCAW-GS for welding Duplex material grade UNS 31803 ( P No. 10H ) and why ?

Also, share the best Preheat method for high alloy steels to remove moisture and for high thk joint applications .

Awaiting for your reply.

Thanks and Regards,
Saravanan,
Korea.

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Saturday, December 28, 2013

Re: [MW:19731] Re: DIFFERENCE BETWEEN ER70S-2 &ER70S-6

In the first part - ER 70S-6 & ER 70S-2:

S-6: contains very high Manganese & Silica content which will act as de-oxidizers and could

be used along with CO₂ as shielding gas. Radiographic quality of weld is not mandatory.

Recommended for GMAW (MIG & MAG) process.

S-2: contains limited amount of Mn & Si, but has additional elements like Zn – Al – Ti, which will

act as deoxidizers and could be used along with Argon ( or) with Ar (+) O₂ as shielding gas.

100 % radiographic quality of weld is obtainable. Recommended for GTAW (TIG) process.

In the second part i.e., with ER 70S-6:

The said golden spots are nothing but non-metallic slag spots, caused by the reaction of excessive Manganese (Mn)

used as a de-oxidizer in S-6 wire and reaction of Mn (+) Oxygen, which is transferred through CO₂ shielding gas.

It will not stick to weld surface and could be removed easily by hand / power brushing and it is a general post weld

practice if surface painting to be done. But, spots can be controlled through proper selection of Voltage / current

ratios, by using Ar (+) CO₂ mixture gas and good bead ripple finish.

If required you can use ER 70S-2, but it is 3 times expensive to S-6 wire. Alternatively, S-3 also could be used with

Argon gas.

Sridhar.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ram Yadav <yadav.vikram394@gmail.com>
To: materials-welding@googlegroups.com
Sent: Saturday, 28 December 2013 9:12 AM
Subject: [MW:19730] Re: DIFFERENCE BETWEEN ER70S-2 &ER70S-6

Dear Sir,

I am using ER70S-6 for GMAW. But found golden spots after welding. Are these golden spots Silicon Oxide or somthing else.

These golden spots causes problem during paint as its a not metal it is not covered in CED bath. I always found these spots more brighter after the paint baking.I want to eleminate this probem.

So can i switch to any other wire with less silicon composition or there is any better alternate available.

Please Suggest.

On Monday, November 26, 2012 1:49:14 PM UTC+5:30, vinu raveendran wrote:

Dear Members,

I would like to know difference between ER70S2 &ER70S6?

What does "2" and "6" mean in them and which welding process we use them?

Thankyou!

--
VINU RAVEENDRAN

[MW:19729] pressure testing difference for cyclic and fatigue tests

Dear friends,

Kindly differentiate the Hydro Cyclic Test and Hydro Fatigue Test.

Thanks&Regards,

B.Sudharsanam

Design Department

Goodrich Gasket Private Limited

Ph.No.+91 7299048721

Ph.No.+91 9551354411, +91 9551283311,Ext.No.221

Tel.+91-44-27498033

Fax: +91-44-27498055

Email Id: mij@flosil.com

Web: www.flosil.com

P Please consider our environment and think before you print. Thank you! q

[MW:19730] Re: DIFFERENCE BETWEEN ER70S-2 &ER70S-6

Dear Sir,

I am using ER70S-6 for GMAW. But found golden spots after welding. Are these golden spots Silicon Oxide or somthing else.

These golden spots causes problem during paint as its a not metal it is not covered in CED bath. I always found these spots more brighter after the paint baking.I want to eleminate this probem.

So can i switch to any other wire with less silicon composition or there is any better alternate available.

Please Suggest.

On Monday, November 26, 2012 1:49:14 PM UTC+5:30, vinu raveendran wrote:

Dear Members,

I would like to know difference between ER70S2 &ER70S6?

What does "2" and "6" mean in them and which welding process we use them?

Thankyou!

--
VINU RAVEENDRAN

Friday, December 27, 2013

Re: [MW:19728] API-570 Computerised from 2014 on wards

Yes Mohammed

I am planning to take API 510 in next year.

Can someone guide me how to take this certification. Include application process, course material, mode and type of exam, when and where?

Regards

Abdul Rahoof

Abu Dhabi

UAE

0505504721

On Friday, 27 December 2013, S.Mohammed wrote:

Dear all,

for whom is pursuing API-570,510,

from 2014 onwards API exams will be comperised and no need to carry any code books or any stuff!!!

regards,

mohammed.

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with regards,

Rahoof Hassan,
Abu Dhabi, UAE

[MW:19727] API-570 Computerised from 2014 on wards

Dear all,

for whom is pursuing API-570,510,

from 2014 onwards API exams will be comperised and no need to carry any code books or any stuff!!!

regards,

mohammed.

Re: [MW:19726] Argon (98%) + Nitrogen (2%) Gas Purging.....

Addition to batt acharya

Nitrogen is strong austenite former, this will reduce loss of austenite during welding

Regards,

Vidhyapathi

On 26 Dec, 2013, at 12:48 pm, <Amitabha.Bhattacharya@voestalpine.com> wrote:

Hi,

For reasons of simplicity & practicality, it is most common to use the same gas for both backing & shielding. However, the lowest levels of oxidation are obtained using a backing gas with mixture of Nitrogen.

The addition of up to 2% Nitrogen in a binary or tertiary gas mixture will raise the partial pressure of Nitrogen above the weld pool in GTAW root runs. This helps to control the nitrogen content in the weld. The addition of nitrogen also compensates for losses in the arc during welding of nitrogen alloyed steels.

With Regards

Amitabha Bhattacharya

voestalpine Bohler Welding India Pvt. Ltd.

voestalpine Bohler Application Technology Centre

M. +91-98 33998246

www.voestalpine.com/welding

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ram Chatt
Sent: Wednesday, December 25, 2013 7:49 PM
To: materials-welding@googlegroups.com
Subject: [MW:19720] Argon (98%) + Nitrogen (2%) Gas Purging.....

Dear Experts,

Argon (98%) + Nitrogen (2%) gas purging for duplex steel (S 32750 A790 P10H) material GTAW welding .what is the purpose mixing with Nitrogen (2%) , its mandatory ? If not mixing any defects will Occurred in welding ?

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Thursday, December 26, 2013

Re: [MW:19724] PQR dia range not qualified and conducted WQT

As far as i know, the pipe diameter is nor essential neither supplementary essential for the PQR (ASME IX).

Accepted in accordance with ASME IX if:

- the thickness to be welded is cover by QW-451 (PQR).

- the thickness to be welded is cover by QW-452.1(b) (WPQ).

Regards

Joseph Faustin Mbe

QA/QC Engineer

TEL CMR (00237) 33129846

TEL CG (00242) 057388009

mbejoseph@yhaoo.fr

BP 1155 Pointe Noire

Yesterday is the pass, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

Le Jeudi 26 décembre 2013 5h28, Dominic v.k.dominic <v.k.dominic@gmail.com> a écrit :

Dear Experts,

We have qualified PQR test coupon dia 2.5". but WPS not mentioned diameter range qualified

Contractor qualified WQT 1/2" Piping weld,accordingly welding has been done for 3/4" size pipe.

Please provide your valuable suggestion to these welding accept or reject as per section 1X.

Best Regards,

Dominic V.K.

QA/QC-Inspector.

GAZPROM NEFT BADRA B.V.

Badra Base Camp, Badra, Wasit, IRAQ.

Mobile No +9647823006598.

Think Quality, Safety Tomorrow.

Re: [MW:19725] PQR dia range not qualified and conducted WQT

Mr,Dominic,

As per the Sec IX, diameter is not essential variable. WQT done as per the PQR. Refer QW 256 for GTAW process. I hope you satisfy.

Pramodh ramanunny

Iraq badra oil feild

Sent from my iPad

On 25-Dec-2013, at 6:26 pm, "Dominic v.k.dominic" <v.k.dominic@gmail.com> wrote:

Dear Experts,

We have qualified PQR test coupon dia 2.5". but WPS not mentioned diameter range qualified

Contractor qualified WQT 1/2" Piping weld,accordingly welding has been done for 3/4" size pipe.
Please provide your valuable suggestion to these welding accept or reject as per section 1X.

Best Regards,
Dominic V.K.
QA/QC-Inspector.
GAZPROM NEFT BADRA B.V.
Badra Base Camp, Badra, Wasit, IRAQ.

Mobile No +9647823006598.
Think Quality, Safety Tomorrow.
<90902168.gif>

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[MW:19723] PQR dia range not qualified and conducted WQT

dear one

what is thk.of pqr coupen.

dia is essential for welder not for wps.

regards
mohd.

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RE: [MW:19722] Argon (98%) + Nitrogen (2%) Gas Purging.....

Hi,

For reasons of simplicity & practicality, it is most common to use the same gas for both backing & shielding. However, the lowest levels of oxidation are obtained using a backing gas with mixture of Nitrogen.

The addition of up to 2% Nitrogen in a binary or tertiary gas mixture will raise the partial pressure of Nitrogen above the weld pool in GTAW root runs. This helps to control the nitrogen content in the weld. The addition of nitrogen also compensates for losses in the arc during welding of nitrogen alloyed steels.

With Regards

Amitabha Bhattacharya

voestalpine Bohler Welding India Pvt. Ltd.

voestalpine Bohler Application Technology Centre

M. +91-98 33998246

www.voestalpine.com/welding

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ram Chatt
Sent: Wednesday, December 25, 2013 7:49 PM
To: materials-welding@googlegroups.com
Subject: [MW:19720] Argon (98%) + Nitrogen (2%) Gas Purging.....

Dear Experts,

Argon (98%) + Nitrogen (2%) gas purging for duplex steel (S 32750 A790 P10H) material GTAW welding .what is the purpose mixing with Nitrogen (2%) , its mandatory ? If not mixing any defects will Occurred in welding ?

Wednesday, December 25, 2013

[MW:19721] PQR dia range not qualified and conducted WQT

Dear Experts,

We have qualified PQR test coupon dia 2.5". but WPS not mentioned diameter range qualified

Contractor qualified WQT 1/2" Piping weld,accordingly welding has been done for 3/4" size pipe.

Please provide your valuable suggestion to these welding accept or reject as per section 1X.

Best Regards,

Dominic V.K.

QA/QC-Inspector.

GAZPROM NEFT BADRA B.V.

Badra Base Camp, Badra, Wasit, IRAQ.

Mobile No +9647823006598.

Think Quality, Safety Tomorrow.

[MW:19720] Argon (98%) + Nitrogen (2%) Gas Purging.....

Dear Experts,

Re: [MW:19719] RE:

machining doesn't have any stress issues , if proper speed feed and depth of cut with coolant used

On Mon, Dec 23, 2013 at 9:33 PM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:

machining/grinding shall induce residual stress, so if possible avoid after SR

On Mon, Dec 23, 2013 at 3:10 PM, mustaffi <mustaffi@dynac.com.my> wrote:

Dear Mr.Bala ,

Why it cannot can you explain..

Practically ,machining it's concern about removed the thickness plates after welding repair or buttering weld on surface flanges.

Regards

Mustaffi Mohd

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bala Murugan
Sent: Monday, 23 December, 2013 4:57 PM
To: materials-welding

Subject: Re: [MW:19698] RE:

No it was not accepted.

Thanks,

Bala

On Mon, Dec 23, 2013 at 2:20 PM, Santosh Dantuluri <santosh-85@hotmail.com> wrote:

From: santosh-85@hotmail.com

To: welding@googlegroups.com
Subject:
Date: Mon, 23 Dec 2013 14:18:44 +0530

Dear experts,

As per API 650(Storage tank) can we proceed for machining on man hole flange face after stress relieving?

Thanks in advance.

Regards
Santossh

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AJAYGHOSH
1440014 5015001

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