Re: [MW:33007] Black soot in MIG

AC GTAW with water cooled torch & HF unit

Thanks & Regards may be suitable for sheet metal.

J.Gerald Jayakumar

0091-8838619635

On Thursday, 31 March, 2022, 04:16:04 pm IST, Prem Nautiyal <prem.nautiyal26@gmail.com> wrote:

Hi Anthony 

You may please try with 99.9995% Ultra Pure Argon gas. Use a gas cup size of 20#.

Use the forehand technique in MIG.

MIG always works with DC, for GTAW you should go with AC.

Use a better quality branded filler wire spool.

Regards 

Prem Nautiyal 

Welding & NDT Specialist 

Cell 9769316004

On Thu, 31 Mar 2022, 15:36 'james gerald' via Materials & Welding, <materials-welding@googlegroups.com> wrote:

Try AC current

Thanks & Regards

J.Gerald Jayakumar

On Thursday, 31 March, 2022, 01:03:59 pm IST, Anthony Dalisay <anthonydalisay6@gmail.com> wrote:

Dear experts,

We have been welding aluminized sheet using MIG welder with the following parameters:

Amps: 125

Volts: 29.5

TS: 50cm/min

Gas flow rate: 12L/min

Gas type : 18%CO2 and 82%Ar

However, I cant get rid of black soot (smoke) in the weld vicinity. What do you think, is the best way to do to achieve cleaner weld in aluminized sheet such as this? 

Refer to attached photo for reference.

Thanks in advance for your expert advice.

Regards,

Anthony

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Re: [MW:33006] Black soot in MIG

Hi Anthony 

You may please try with 99.9995% Ultra Pure Argon gas. Use a gas cup size of 20#.

Use the forehand technique in MIG.

MIG always works with DC, for GTAW you should go with AC.

Use a better quality branded filler wire spool.

Regards 

Prem Nautiyal 

Welding & NDT Specialist 

Cell 9769316004

On Thu, 31 Mar 2022, 15:36 'james gerald' via Materials & Welding, <materials-welding@googlegroups.com> wrote:

Try AC current

Thanks & Regards

J.Gerald Jayakumar

On Thursday, 31 March, 2022, 01:03:59 pm IST, Anthony Dalisay <anthonydalisay6@gmail.com> wrote:

Dear experts,

We have been welding aluminized sheet using MIG welder with the following parameters:

Amps: 125

Volts: 29.5

TS: 50cm/min

Gas flow rate: 12L/min

Gas type : 18%CO2 and 82%Ar

However, I cant get rid of black soot (smoke) in the weld vicinity. What do you think, is the best way to do to achieve cleaner weld in aluminized sheet such as this? 

Refer to attached photo for reference.

Thanks in advance for your expert advice.

Regards,

Anthony

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Re: [MW:32997] PPM to mg/m2 conversion

Please correct it as 2000ppm

Thanks & Regards

J.Gerald Jayakumar

On Monday, 28 March, 2022, 09:55:17 am GMT+4, james gerald <gerry_tup@yahoo.com> wrote:

1% is 10000 ppm and it must be 20ppm, please check

Thanks & Regards

J.Gerald Jayakumar

On Monday, 28 March, 2022, 07:14:50 am GMT+4, Muhammed Ibrahim PK <ibratech@gmail.com> wrote:

Gents,

Is there any conversion available for ppm to mg/m2?

For Aramco projects, the chloride content measured in ppm using bresle patch kit in ppm.

As per Aramco spec the acceptable range is 20mg/m2.

Couldn't find the conversion. If anybody can advice, it will ne highly appreciated

Reg,

Ibrahim

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Re: [MW:32997] PPM to mg/m2 conversion

1% is 10000 ppm and it must be 20ppm, please check

Thanks & Regards

J.Gerald Jayakumar

On Monday, 28 March, 2022, 07:14:50 am GMT+4, Muhammed Ibrahim PK <ibratech@gmail.com> wrote:

Gents,

Is there any conversion available for ppm to mg/m2?

For Aramco projects, the chloride content measured in ppm using bresle patch kit in ppm.

As per Aramco spec the acceptable range is 20mg/m2.

Couldn't find the conversion. If anybody can advice, it will ne highly appreciated

Reg,

Ibrahim

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Re: [MW:32997] PWHT of blind flanges not having welding

I suppose except Manway, all blind flanges are temporary and it comes with a trunion attachment

Thanks & Regards

J.Gerald Jayakumar

On Monday, 28 March, 2022, 07:15:06 am GMT+4, Balakrishnan Srinivasan <sbkay333@gmail.com> wrote:

Check the MTC of the blind flange, if it fulfills the requirement of sour service/ NACE, it might have been normalized at the fabrication shop. Then no need for PWHT as of best of understanding.

Warm Regards,

Balakrishnan S

On Mon, Feb 28, 2022 at 2:20 PM Gerry Lourens <Gerry.Lourens@newage-eng.com> wrote:

No Welding thus PWHT not required

 Kind Regards

Gerry lourens

Regards,
Gerry Lourens Welding Engineer
M:   +27 62 192 1207 T:    +27 17 631 5282 F:    +27 (0)86 616 9701 E:    gerry.lourens@newage-eng.com A:    3 York Street, Evander, 2280
Disclaimer Copy: CG Africa Holdings(Proprietary) Limited (Company Number 2015/235049/07), herein referred to as CG Africa Holdings, is a South African company whose Registered Office is CG Africa Holdings Head Office: 845 16th Road, Midrand, Johannesburg. CG Africa Holdings has direct interests in Prommac (Company Number 2005/040679/07), New Age Engineering Solutions (Company Number 2017/165/330/07) and Kumunyack (Company Number 2015/400060/07). This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. Our organization and all subsidiary group companies accept no liability for the content of this email, or for the consequences of any actions taken on the basis of the information provided, unless that information is subsequently confirmed in a document signed by an authorized representative. No employee or agent is authorized to conclude any binding agreement or make any commitment on behalf of CG Africa Holdings and any associated group companies with another party by email without express written confirmation by an authorised Director.

On Mon, Feb 28, 2022 at 10:33 AM Muhammed Ibrahim PK <ibratech@gmail.com> wrote:

Gentlemen,

Please advice PWHT required or not for small blind flanges also if the vessel is in sour service.The blinds having no welding on it.

As per my understanding PWHT is only for weld, not for base metal.

If welding on blinds like davit, manway handle can be justified. Is it required for other blinds not having any weld on it.

Experts please provide your view on it.

Reg,

Ibrahim

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Re: [MW:32993] PWHT of blind flanges not having welding

Agreed the PWHT is done for welding, however it is good engineering practice to have all part of equipment undergoing same heat treatment for uniform micro structure across all parts especially very good to practice this for equipment having NACE & sour service.

Even blind flange will come in contact with service fluid during process.

Discussed this case with many AI & all have same opinion, however do not find any code restrictions. 

Also to be noted, we do local SR for some weld due to various reason.

On Mon, Feb 28, 2022, 14:20 Gerry Lourens <Gerry.Lourens@newage-eng.com> wrote:

No Welding thus PWHT not required

 Kind Regards

Gerry lourens

Regards,
Gerry Lourens Welding Engineer
M:   +27 62 192 1207 T:    +27 17 631 5282 F:    +27 (0)86 616 9701 E:    gerry.lourens@newage-eng.com A:    3 York Street, Evander, 2280
Disclaimer Copy: CG Africa Holdings(Proprietary) Limited (Company Number 2015/235049/07), herein referred to as CG Africa Holdings, is a South African company whose Registered Office is CG Africa Holdings Head Office: 845 16th Road, Midrand, Johannesburg. CG Africa Holdings has direct interests in Prommac (Company Number 2005/040679/07), New Age Engineering Solutions (Company Number 2017/165/330/07) and Kumunyack (Company Number 2015/400060/07). This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. Our organization and all subsidiary group companies accept no liability for the content of this email, or for the consequences of any actions taken on the basis of the information provided, unless that information is subsequently confirmed in a document signed by an authorized representative. No employee or agent is authorized to conclude any binding agreement or make any commitment on behalf of CG Africa Holdings and any associated group companies with another party by email without express written confirmation by an authorised Director.

On Mon, Feb 28, 2022 at 10:33 AM Muhammed Ibrahim PK <ibratech@gmail.com> wrote:

Gentlemen,

Please advice PWHT required or not for small blind flanges also if the vessel is in sour service.The blinds having no welding on it.

As per my understanding PWHT is only for weld, not for base metal.

If welding on blinds like davit, manway handle can be justified. Is it required for other blinds not having any weld on it.

Experts please provide your view on it.

Reg,

Ibrahim

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[MW:32987] Use of SA 240 Gr. 316LN under section VIII Div.1

Inquiry : May SA 240 Gr.316LN be used in Sec.VIII Div.1 since it is specified as "NP (NOT PERMITTED)" under Sec.IID.

does this mean all the materials which are not listed in UHA 23 are categorised as NP in Sec IID, should be regularised or used thro code case only?

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Re: [MW:32986] Super duplex PQR for corrosion test.

Pls also add Test temperature

Thanks & Regards

J.Gerald Jayakumar

On Monday, 21 March, 2022, 07:50:54 am GMT+4, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Please provide details like

Grade

Type of corrosion test like ASTM G48 method A

Shielding and purging gas

corrosion test failure due to weight loss or pitting

Welding consumable

Oxygen purity maintained in the purge gas

Thanks & Regards

J.Gerald Jayakumar

On Monday, 21 March, 2022, 07:21:40 am GMT+4, PK M <pkmqaqc@gmail.com> wrote:

Dear Experts,

 

We have recently failed the super duplex PQR for corrosion test.

So please suggest how to successfully super duplex PQR with a corrosion test.

Any prevention for corrosion test or all other tests for Super Duplex stainless steel.

Thank you.

Pk

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Re: [MW:32985] Super duplex PQR for corrosion test.

Please provide details like

Grade

Type of corrosion test like ASTM G48 method A

Shielding and purging gas

corrosion test failure due to weight loss or pitting

Welding consumable

Oxygen purity maintained in the purge gas

Thanks & Regards

J.Gerald Jayakumar

On Monday, 21 March, 2022, 07:21:40 am GMT+4, PK M <pkmqaqc@gmail.com> wrote:

Dear Experts,

 

We have recently failed the super duplex PQR for corrosion test.

So please suggest how to successfully super duplex PQR with a corrosion test.

Any prevention for corrosion test or all other tests for Super Duplex stainless steel.

Thank you.

Pk

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Re: [MW:32971] Fillet weld requirements for Tank

Please provide below information.

1. Applicable code like API 620 or 650 etc..

2. Location like clean out door etc..

3. Material

Thanks & Regards

J.Gerald Jayakumar

On Thursday, 10 March, 2022, 08:26:12 am GMT+4, Rajesh Babu Pendyala <pendyala1979@gmail.com> wrote:

Dear Friends 

I need info about Fillet welding requirements in Tank

24" x12MM machined flanges with 17.48mm Nozzle pipe welding and nozzle Pipe will insert up to 6mm in flange. What are the welding requirements. 

Refer attached drawing.

Can any one advice please.

Regards 

Rajesh Babu 

Inspection Engineer

For Tank Maintenance Project 

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Re: [MW:32964] Chromium Carbide Coating

You should do lpt

On Wed, 9 Mar 2022, 1:34 pm SN, <suryawanshinileshj@gmail.com> wrote:

Dear experts,

Could  you please confirm that can we do MPT after  chromium carbide Coating. Since chromium  carbide Coating is suppose to be nonmagnetic.

Can anyone confirm  that chromium carbide Coating is magnetic or Non Magnetic..

Thanks 

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RE: [MW:32959] Inconel 6625 Gr1 - PQR tensile requirements

Hi

Some basic information on this alloy is  provided here. If the alloy is of Grade 1 type,  meeting the nominal UTS with ER-NiCr-Mo3 filler and matching SMAW electrodes may be difficult. This would NOT be an issue if the alloy is changed to Type 2,(Solution Annealed ) variety. Pleas find the relevant information as attached.

 

At the first place, I would like to know, what's the rationale behind choosing Type-1 alloy(Annealed) , strength/weight reduction?

Response would be appreciated.

 

Thanks.

 

 

P.Goswami.P.Eng, IWE.

Independent  & Consulting Welding & Metallurgical Specialist

Cell/Whasapp- 1-905-979-3232

India( Mobile) Till 10th April- 91-8981917949

 

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of TDK YOKESH
Sent: March 8, 2022 6:11 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:32958] Inconel 6625 Gr1 - PQR tensile requirements

 

Hi Balakriahnan, 

 

I do have the same concern with Gr. 1 of UNS 6625 when welded with ERNiCrMo3 Kindly do reconfirm of grade again (Gr. 1 or Gr. 2) . Did you check if the filler manufacturer can retest the tensile properties and provide the as welded values? 785Mpa  which is 95% of 827Mpa will suffice thd requirment.  We do all weld tensile test for every batch we receive. 

I hope the expert in this forum can guidw us to sort this out. 

 

On Tue, Mar 8, 2022, 9:15 AM Balakrishnan Srinivasan <sbkay333@gmail.com> wrote:

Dear Experts,

 

Greetings for the day!!

 

I want to quality PQR for Base material UNS N06625 GR1 which has tensile property 827Mpa,   ERNiCrMo-3 Fillerwire was selected based on API582 & ASME sec II C recommendations. The filler wire tensile value is 760Mpa. 

In PQR tensile test result lies in between 760-827 Mpa.  The obtained tensile value is not greater than the base metal.   It can't fulfill the requirement of  QW-153 (ASME SEC IX).

As stated above clause QW153.1.c, " the applicable section".

 

Are there any provisions to qualify with lower strength than base metal?.

 

Reference WPSs were approved based on the tensile value being greater than filler metal tensile value (UTS)  760 Mpa  MIN (sec II C), But there we could not get explanations from the originators.

 

Please also refer, ASME-B 31.3  clause 328.3.1 (welding materials) & ASME sec VIII div1 QW-06 (non-mandatory guidelines for welding material selection.

Thank you

Balakrishnan S

 

 

 

 

 

 

 

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Re: [MW:32958] Inconel 6625 Gr1 - PQR tensile requirements

Hi Balakriahnan, 

I do have the same concern with Gr. 1 of UNS 6625 when welded with ERNiCrMo3 Kindly do reconfirm of grade again (Gr. 1 or Gr. 2) . Did you check if the filler mamufacturer can retest the tensile properties and provide the as welded values? 785Mpa  which is 95% of 827Mpa will suffice thd requirment.  We do all weld tensile test for every batch we receive. 

I hope the expert in this forum can guidw us to sort this out. 

On Tue, Mar 8, 2022, 9:15 AM Balakrishnan Srinivasan <sbkay333@gmail.com> wrote:

Dear Experts,

Greetings for the day!!

I want to quality PQR for Base material UNS N06625 GR1 which has tensile property 827Mpa,   ERNiCrMo-3 Fillerwire was selected based on API582 & ASME sec II C recommendations. The filler wire tensile value is 760Mpa. 

In PQR tensile test result lies in between 760-827 Mpa.  The obtained tensile value is not greater than the base metal.   It can't fulfill the requirement of  QW-153 (ASME SEC IX).

As stated above clause QW153.1.c, " the applicable section".

Are there any provisions to qualify with lower strength than base metal?.

Reference WPSs were approved based on the tensile value being greater than filler metal tensile value (UTS)  760 Mpa  MIN (sec II C), But there we could not get explanations from the originators.

Please also refer, ASME-B 31.3  clause 328.3.1 (welding materials) & ASME sec VIII div1 QW-06 (non-mandatory guidelines for welding material selection.

Thank you

Balakrishnan S

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Re: [MW:32953] What is difference between LST and MDMT

MDMT is taken in a Totality the lowest temperature attained either due to Environment, Service temperature, upset conditions etc..

Thanks & Regards

J.Gerald Jayakumar

On Thursday, 3 March, 2022, 12:33:14 pm GMT+4, SN <suryawanshinileshj@gmail.com> wrote:

Dear all,

Can you please explain 

What is the difference between MDMT and LST

Is MDMT(Minimum Metal Design Temperature ) and LST(Lowest Service Temperature) is same.

This concept is applicable  the exemption of Impact test requirements  as per UCS 66 and section III NF

Kindly clarify

Thanks.

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Re: [MW:32952] WPQ of single process having combination PQR

Yes you do

Στις Σάβ 26 Φεβ 2022 στις 6:08 π.μ., ο/η Brijesh Maurya <brijeshmaurya492@gmail.com> έγραψε:

Dear All,

I have PQR of GTAW + SMAW process for P1G2 to P1G2 (SA516 GR.70 to SA516 GR.70)

PQR Plate thickness = 10 mm

GTAW welded = 4 mm

SMAW welded = 6 mm

WPS range qualified = 1.5 to 20 mm.

Now, My query is, can i use this WPS for WPQ by GTAW process only?

I want to qualify my welder on 1/2"NB X SCH 160 (4.78 THK) pipe with only GTAW process using this WPS.

Kindly Clarify Experts........

Regards,

Brijesh Maurya

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Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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Re: [MW:32950] PWHT of blind flanges not having welding

It is not required if code of construction and client specification doesnt write it anywere... no need of that

On Wed, 2 Mar 2022, 7:17 am anthony chundal, <anthony.chundal@gmail.com> wrote:

It is required for service requirements, even though there is no welding

On Mon, 28 Feb 2022, 12:33 Muhammed Ibrahim PK, <ibratech@gmail.com> wrote:

Gentlemen,

Please advice PWHT required or not for small blind flanges also if the vessel is in sour service.The blinds having no welding on it.

As per my understanding PWHT is only for weld, not for base metal.

If welding on blinds like davit, manway handle can be justified. Is it required for other blinds not having any weld on it.

Experts please provide your view on it.

Reg,

Ibrahim

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Re: [MW:32949] PWHT of blind flanges not having welding

It is required for service requirements, even though there is no welding

On Mon, 28 Feb 2022, 12:33 Muhammed Ibrahim PK, <ibratech@gmail.com> wrote:

Gentlemen,

Please advice PWHT required or not for small blind flanges also if the vessel is in sour service.The blinds having no welding on it.

As per my understanding PWHT is only for weld, not for base metal.

If welding on blinds like davit, manway handle can be justified. Is it required for other blinds not having any weld on it.

Experts please provide your view on it.

Reg,

Ibrahim

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