Materials & Welding: July 2014

Thursday, July 31, 2014

[MW:21499] Welding Process Change ( From SMAW to GMAW)

Hello Expert,

I am seeking your technical advice in terms of Welding process.

For welding of crane girder we are using SMAW welding with root and hot pass DPT.

Now people want to change the welding process from SMAW to GMAW. (but root with SMAW)

Plate thickness ranging from 25 mm to 50 mm.

Please give your advice,

Your prompt action will be highly appreciated

Regards

Aakash

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[MW:21503] Re: difference between API 2W 50 and API 2W 50T

Both are very similar with min. yield stress of 50ksi (50T has higher range though 50-80ksi compared to 50-75ksi of 50). See more here

Cheers

ChemKB

On Thursday, July 24, 2014 3:44:01 AM UTC-5, prabuharan marimuthu wrote:

Hi all,

May someone clarify me what are the difference between API 2W 50 and API 2W 50T because both of them looks similar to me.

Thank You

[MW:21502] CAN WE PERFORM PWHT AFTER SS 304 CLADING/OVERLAY ON ALOY STEEL

Dear Sir,

I have to do PWHT after explosive bonding and some portion overlay welding in heat exchanger. We have to do overlay and weld cladding of SS 304 on SA 336 Gr. F5. PWHT heating cycle is 720 C at 2 hours.

Material : SA 336 Gr F5 + SS 304 CLAD

now my doubt is if we will do PWHT in sensitization range so that there is chance of IGC in SS material and SS clading will not fulfill its corrosin resistance purpose.

so kindly pls suggest we can do or not do???

Thanks,

Hemant Suthar

7600096712

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[MW:21501] Re: Tests for unknown material

Thank you all for your advice. I forgot to mentioned that I have been handled a very small sample of each type of material. Therefore, destructive tests are out of the question. Would you gentlemen say, PMI and hardness test could provide sufficient data to determine what grade of material those samples are likely to be?

Best regards,

Tim

On Wednesday, July 30, 2014 1:57:22 PM UTC+8, Tim Lim wrote:

Esteemed Group Members,

If you are handed a sample material cut out. What tests would you order to determine its quality?

Best regards,
Tim

[MW:21500] Re: Flange leak in hydrotest

Dear Kumar,

after your question, many have commented and asked you some clarifications. kindly respond to keep the spirit of knowledge sharing. even if you have solved the issue , share it.

good luck to all.

On Friday, July 25, 2014 10:28:27 AM UTC+3, sunilkumar kundothara wrote:

Dear all,
During the hydrotest of a product line of about 1.3 km (asme B31.3/4, 24 bar test pressure, 4 hour holding time), 2 blind flanges are given at each end. One of the flanges were found as leaking (as drops) upon inspection. Around 15 mtr. Of the line in between is underground and hidden as well. Sub-contractor is arguing that line has a pressure around 27 bar (due to temp.) Which is above test pressure thus can be accepted. They are saying code allows "blind flange leakage" also. Anyhow we are not agreeing for that. Expecting your valuable feedback on this issue.
Thanks in advance,
Kumar.

[MW:21492] Does SS410S Weld overlay / butt welds (of SS 410S) requires PWHT?

its depend whethet CRO done for strength purppse or corosion purpose.
for strength req
for corrosion not req.

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Re: [MW:21492] Technical Query - Is it necessary to (RT) penalty/tracer for second time repaired welder?

would you pl attaced pdf of this interpretation.

interpretation 1-62 subject
336.5, Types & Extent of required
examinations date issued 1982 june 9 file
number 1578
Please look for answers in code
interpretation questions. Q-1,2,3

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[MW:21492] Tests for unknown material

1.metallography
2. PMI
3. hardness
4.micro hardness.

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Wednesday, July 30, 2014

Re: [MW:21492] Tests for unknown material

Dear Kim ,

Based on your requirement basic and simple test is chemical analysis from which you can know the elements present in material. If you wanted to know mechanical properties need to carry out tesile, Izod Etc.

Regrads.

Manjunath T Madiwalar.

On Wed, Jul 30, 2014 at 11:27 AM, Tim Lim <th.lim@synchonghoe.com> wrote:

Esteemed Group Members,

If you are handed a sample material cut out. What tests would you order to determine its quality?

Best regards,
Tim

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Re: [MW:21492] Re: Initial prodution weld RT after WQT.

Dear
It is Company Specifications or Standards Requirements. Just to Evaluate the Quality of Weld in Production Process. Which are not Counting for the % criteria for the production weld NDE.

Thanks & Regards

PRADEEPKUMAR HORMIS

Lead Welding Inspector,

JACOBS, Chem-1(Chlorine & Brine Project)

Mob. 0551682908

On Mon, Jul 28, 2014 at 7:25 AM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

This is for initial qualification of welders

THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY

On Sun, Jul 27, 2014 at 7:06 PM, Sahavas v s <sahavas143r@gmail.com> wrote:

Hello,

As per QW-301.2 need production joint and as per QW-304.1 minimum 150mm length of the first production weld(s) made by welder may be examined by volumetric NDT.

On Friday, July 25, 2014 8:46:14 AM UTC+3, S.Mohammed wrote:

Dear all

Is there any where mentioned in ASME that we have to take initial prodution joint RT TWO or FIVE joint after Welder qualifition passed.

Regards

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Re: [MW:21491] WPS of SS 304L

Lack of fusion: base metal not melted. Why? Because base metal temperature did not achieve 1510 degC. Why? Because heat input not adequate (forget high or low). You may use a high heat input welding method (per definition) and you may still get lack of fusion. With GMAW it happens mainly because the welder "runs" too fast in order to achieve high productivity rates. You do not wonder why many EPC specs do not allow GMAW either for pressure equipment or for critical structural steel?
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

From: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
Sent: 07/30/2014 09:15 AM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21489] WPS of SS 304L

Incomplete fusion is due to less Heat input?? not because of voltage. mainly depend on current and other factor also

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

On Tue, Jul 29, 2014 at 7:42 PM, <george.dilintas@gr.bureauveritas.com> wrote:

...and you get frequently luck of fusion
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
Sent: 07/29/2014 02:07 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21487] WPS of SS 304L

voltage depends on Arc length , manual welding ( constant current), it varies with welder to welder and u can preset the voltage before start welding but u can set amps,, but in GMAW, u can preset voltage and separately and Arc length will be always constant because it is Constant Voltage/Potential Power source

THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY

On Tue, Jul 29, 2014 at 1:46 PM, <george.dilintas@gr.bureauveritas.com> wrote:
In GTAW the arc is 10 to 15 Volt. In the other processes the arc is much higher. In GMAW a very skilled welder may achieve 20 Volts. The Amps depend on the diameter of the rod and the speed on the ability of the welder who in this process has a very good control of the pool which crucial for the heat input. The overall efficiency may be low but if the lost energy is not dissipated in the weld pool it is not contributing to the heat input in the weld
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 09:16 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21481] WPS of SS 304L

Dear Sir,
How GTAW is lower heat input process in which small dia. Wire use high current with low speed!!
Please clarrify my doubt.
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 2:27 PM, <george.dilintas@gr.bureauveritas.com> wrote:
GTAW is a low heat input process
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 12:14 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21469] WPS of SS 304L

You can do per as good engineering practice this can lead to problem in weld after welding with GTAW on SMAW pass due to high heat input in GTAW..
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 6:52 AM, "harenath jha" <harenathjha@gmail.com> wrote:
Hello Expert,

I am having a wps which is done with GTAW (Root)+ SMAW (Fill-up and final),
Can we weld a joint in the following sequence
Root with GTAW , Fill-up with SMAW and final pass or capping with GTAW ?

Is there any code supporting details ?
plate thick. 32 mm & dia approx 6 meter

Regards
Aakash

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Re: [MW:21497] Tests for unknown material

Dear Tim,

Do both the Mechanical and Chemical analysis as per the Mill Test Certificate.

Muthusamy.S

அமீரகம்

On 30 July 2014 09:57, Tim Lim <th.lim@synchonghoe.com> wrote:

Esteemed Group Members,

If you are handed a sample material cut out. What tests would you order to determine its quality?

Best regards,
Tim

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[MW:21490] Tests for unknown material

Esteemed Group Members,

If you are handed a sample material cut out. What tests would you order to determine its quality?

Best regards,

Tim

Re: [MW:21489] WPS of SS 304L

Incomplete fusion is due to less Heat input?? not because of voltage. mainly depend on current and other factor also

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

On Tue, Jul 29, 2014 at 7:42 PM, <george.dilintas@gr.bureauveritas.com> wrote:

...and you get frequently luck of fusion
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
Sent: 07/29/2014 02:07 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21487] WPS of SS 304L

voltage depends on Arc length , manual welding ( constant current), it varies with welder to welder and u can preset the voltage before start welding but u can set amps,, but in GMAW, u can preset voltage and separately and Arc length will be always constant because it is Constant Voltage/Potential Power source

THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY

On Tue, Jul 29, 2014 at 1:46 PM, <george.dilintas@gr.bureauveritas.com> wrote:

In GTAW the arc is 10 to 15 Volt. In the other processes the arc is much higher. In GMAW a very skilled welder may achieve 20 Volts. The Amps depend on the diameter of the rod and the speed on the ability of the welder who in this process has a very good control of the pool which crucial for the heat input. The overall efficiency may be low but if the lost energy is not dissipated in the weld pool it is not contributing to the heat input in the weld
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 09:16 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21481] WPS of SS 304L

Dear Sir,
How GTAW is lower heat input process in which small dia. Wire use high current with low speed!!
Please clarrify my doubt.
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 2:27 PM, <george.dilintas@gr.bureauveritas.com> wrote:

GTAW is a low heat input process
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 12:14 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21469] WPS of SS 304L

You can do per as good engineering practice this can lead to problem in weld after welding with GTAW on SMAW pass due to high heat input in GTAW..
Best Regards,
Mohit Aggarwal.

On 27-Jul-2014 6:52 AM, "harenath jha" <harenathjha@gmail.com> wrote:

Hello Expert,

I am having a wps which is done with GTAW (Root)+ SMAW (Fill-up and final),
Can we weld a joint in the following sequence
Root with GTAW , Fill-up with SMAW and final pass or capping with GTAW ?

Is there any code supporting details ?
plate thick. 32 mm & dia approx 6 meter

Regards
Aakash

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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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Tuesday, July 29, 2014

Re: [MW:21488] WPS of SS 304L

...and you get frequently luck of fusion
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

From: Kannayeram Gnanapandithan [kgpandithan@gmail.com]
Sent: 07/29/2014 02:07 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21487] WPS of SS 304L

voltage depends on Arc length , manual welding ( constant current), it varies with welder to welder and u can preset the voltage before start welding but u can set amps,, but in GMAW, u can preset voltage and separately and Arc length will be always constant because it is Constant Voltage/Potential Power source

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

On Tue, Jul 29, 2014 at 1:46 PM, <george.dilintas@gr.bureauveritas.com> wrote:

In GTAW the arc is 10 to 15 Volt. In the other processes the arc is much higher. In GMAW a very skilled welder may achieve 20 Volts. The Amps depend on the diameter of the rod and the speed on the ability of the welder who in this process has a very good control of the pool which crucial for the heat input. The overall efficiency may be low but if the lost energy is not dissipated in the weld pool it is not contributing to the heat input in the weld
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 09:16 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21481] WPS of SS 304L

Dear Sir,
How GTAW is lower heat input process in which small dia. Wire use high current with low speed!!
Please clarrify my doubt.
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 2:27 PM, <george.dilintas@gr.bureauveritas.com> wrote:
GTAW is a low heat input process
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 12:14 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21469] WPS of SS 304L

You can do per as good engineering practice this can lead to problem in weld after welding with GTAW on SMAW pass due to high heat input in GTAW..
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 6:52 AM, "harenath jha" <harenathjha@gmail.com> wrote:
Hello Expert,

I am having a wps which is done with GTAW (Root)+ SMAW (Fill-up and final),
Can we weld a joint in the following sequence
Root with GTAW , Fill-up with SMAW and final pass or capping with GTAW ?

Is there any code supporting details ?
plate thick. 32 mm & dia approx 6 meter

Regards
Aakash

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Re: [MW:21487] WPS of SS 304L

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY

On Tue, Jul 29, 2014 at 1:46 PM, <george.dilintas@gr.bureauveritas.com> wrote:

In GTAW the arc is 10 to 15 Volt. In the other processes the arc is much higher. In GMAW a very skilled welder may achieve 20 Volts. The Amps depend on the diameter of the rod and the speed on the ability of the welder who in this process has a very good control of the pool which crucial for the heat input. The overall efficiency may be low but if the lost energy is not dissipated in the weld pool it is not contributing to the heat input in the weld
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 09:16 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21481] WPS of SS 304L

Dear Sir,
How GTAW is lower heat input process in which small dia. Wire use high current with low speed!!
Please clarrify my doubt.
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 2:27 PM, <george.dilintas@gr.bureauveritas.com> wrote:

GTAW is a low heat input process
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 12:14 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21469] WPS of SS 304L

You can do per as good engineering practice this can lead to problem in weld after welding with GTAW on SMAW pass due to high heat input in GTAW..
Best Regards,
Mohit Aggarwal.

On 27-Jul-2014 6:52 AM, "harenath jha" <harenathjha@gmail.com> wrote:

Hello Expert,

I am having a wps which is done with GTAW (Root)+ SMAW (Fill-up and final),
Can we weld a joint in the following sequence
Root with GTAW , Fill-up with SMAW and final pass or capping with GTAW ?

Is there any code supporting details ?
plate thick. 32 mm & dia approx 6 meter

Regards
Aakash

--
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Re: [MW:21486] WPS of SS 304L

In GTAW the arc is 10 to 15 Volt. In the other processes the arc is much higher. In GMAW a very skilled welder may achieve 20 Volts. The Amps depend on the diameter of the rod and the speed on the ability of the welder who in this process has a very good control of the pool which crucial for the heat input. The overall efficiency may be low but if the lost energy is not dissipated in the weld pool it is not contributing to the heat input in the weld
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 09:16 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21481] WPS of SS 304L

Dear Sir,
How GTAW is lower heat input process in which small dia. Wire use high current with low speed!!
Please clarrify my doubt.

Best Regards,
Mohit Aggarwal.

On 27-Jul-2014 2:27 PM, <george.dilintas@gr.bureauveritas.com> wrote:

GTAW is a low heat input process
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: Mohit Aggarwal [aggarwalmohit05@gmail.com]
Sent: 07/27/2014 12:14 PM ZE5B
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:21469] WPS of SS 304L

You can do per as good engineering practice this can lead to problem in weld after welding with GTAW on SMAW pass due to high heat input in GTAW..
Best Regards,
Mohit Aggarwal.
On 27-Jul-2014 6:52 AM, "harenath jha" <harenathjha@gmail.com> wrote:
Hello Expert,

I am having a wps which is done with GTAW (Root)+ SMAW (Fill-up and final),
Can we weld a joint in the following sequence
Root with GTAW , Fill-up with SMAW and final pass or capping with GTAW ?

Is there any code supporting details ?
plate thick. 32 mm & dia approx 6 meter

Regards
Aakash

--
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Materials & Welding

Thursday, July 31, 2014

[MW:21499] Welding Process Change ( From SMAW to GMAW)

[MW:21503] Re: difference between API 2W 50 and API 2W 50T

[MW:21502] CAN WE PERFORM PWHT AFTER SS 304 CLADING/OVERLAY ON ALOY STEEL

[MW:21501] Re: Tests for unknown material

[MW:21500] Re: Flange leak in hydrotest

[MW:21492] Does SS410S Weld overlay / butt welds (of SS 410S) requires PWHT?

Re: [MW:21492] Technical Query - Is it necessary to (RT) penalty/tracer for second time repaired welder?

[MW:21492] Tests for unknown material

Wednesday, July 30, 2014

Re: [MW:21492] Tests for unknown material

Re: [MW:21492] Re: Initial prodution weld RT after WQT.

Re: [MW:21491] WPS of SS 304L

Re: [MW:21497] Tests for unknown material

[MW:21490] Tests for unknown material

Re: [MW:21489] WPS of SS 304L

Tuesday, July 29, 2014

Re: [MW:21488] WPS of SS 304L

Re: [MW:21487] WPS of SS 304L

Re: [MW:21486] WPS of SS 304L

[MW:35346] Cast-iron welding

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