Materials & Welding: April 2013

Tuesday, April 30, 2013

[MW:17594] WPS for SA 335-P11 to 304 S.S. B31.1 criteria

Does anyone know of a pre-qualified WPS for welding SA 335 P-11 Piping to 304 S.S fittings?

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[MW:17593] RE: 17592] welder is valid

If your weldor is qualifying per ASME Section IX, then the use of alternate base metals is discussed in QW-423.1. The combination you state below is permissible and weldor is qualified.

According to retired committee member I know, the rational is that weldor is only trying to show the ability to deposit sound weld metal. The previously performed PQR established that the actual base metal-weld metal combination possessed the required metallurgical properties. Therefore, the only important issue is that the base metal be sufficiently compatible with the filler metal to allow the weldor qualification coupon to be tested.

John A. Henning

Welding & Materials

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ali.himayat@gmail.com
Sent: Monday, April 29, 2013 11:31 AM
To: materials-welding@googlegroups.com
Subject: [MW:17592] welder is valid

whether welder is valid if WQT done on P1 to P1 with ER308 (F6 A5.9), autual welding production WPS is P8-P8 with filler rod ER308.

Please answer.

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[MW:17594] Re: Hydrotest pressure criteria

Dear,

Factors 1.3 or 1.5 or 1.25 or 1.1 etc. is temperature correction factor included in hydro or pneumatic pressure determination.

Now why this is required to include ?

Because vessel will get operated at higher temerature at that time material will be weak. At ambient or test temperature material will be strong.

So to take effect of weakend material at operating temperature we proportiantely increases testing pressure.

It depends on allowable stress criteria we followed while detrmining allowable stress as per any code.

On Saturday, April 27, 2013 4:32:02 PM UTC+5:30, nishant wrote:

Why hydrotest pressure is taken 1.3 times of design pressure? What is the criteria that fixes the term 1.5 times or 1.25 times, etc.???

Thanks in advance,
Nishant nair
Sent from Yahoo! Mail

[MW:17596] Regarding Kereosene Leak test

Dear Experts,

Here our contractor fabricated the ducts for FDA.

To examine the weld quality Kerosene leak test to be done.

1.Anybody having the procedure for Kerosene Leak test.

2.For duct welding other than Kerosene test is available?

Please Suggest me.

Regards,

Balaji

Monday, April 29, 2013

Re: [MW:17590] WPS, PQR as per BS EN ISO 15614-1

My Dear Friend

Please Refrer En 15609 for WPS Preparation .

En 15614 for WPQR Preparation

On Mon, Apr 29, 2013 at 11:42 AM, Lab <lab@cochinshipyard.com> wrote:

Dear Ady loy,

Please find attached, may be useful for you.

Regards,

A Meganathan

----- Original Message -----

From: adyloy

To: materials-welding@googlegroups.com

Sent: Sunday, April 28, 2013 12:14 PM

Subject: [MW:17575] WPS, PQR as per BS EN ISO 15614-1

Anybody

Can anybody assist me to prepare or how to carry out WPS, PQR WQT as per BS EN ISO 15614-1

Material : SA 106 Grade B, Pipe : 6" OD Sch 80, Weld Process : GTAW+SMAW For Chill Water Project.

Pls furnish format if possible and requirement of Mech Test, NDT etc to qualify as per this standard.

Thanks & Rgds

Ady loy

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[MW:17591] PWHT governing thickness B 31.3 (331.1.3)

Dear Experts,

As per B31.3

a) In the case of branch connections, metal (other than weld metal) added as reinforcement, whether an integral part of a branch fitting or attached as a reinforcing pad or saddle, shall not be considered in determining heat treatment requirements. Heat treatment is required, however, when the thickness through the weld in any plane through the branch is greater than twice the minimum material thickness requiring heat treatment, even though the thickness of the components at the joint is less than the minimum thickness .

The question is what if thickness of components at joint like Tb ( branch pipe )or Th( header) is greater than the minimum thickness requiring PWHT. governing thickness would be based on weld metal through groove or Tb or Th if all are above minimum thickness requiring PWHT. it is a general question and i would be glad to hear from you.

[MW:17592] welder is valid

whether welder is valid if WQT done on P1 to P1 with ER308 (F6 A5.9), autual welding production WPS is P8-P8 with filler rod ER308.

Please answer.

[MW:17589] RE: 17584] Difference between GMAW-S and GMAW-STT

Lincoln’s STT process and Miller’s PipeWorx are both short circuiting arc transfer mode GMAW. The difference is a high level of control on the amperage and voltage to quiet the arc. However they are still short arc and so must follow the follow the ScIX rules applied to that process.

For welder qualification bend tests are required because lack of fusion defects at the root may not be detected by radiography.

John A. Henning

Welding & Materials

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of M.A.Samdani
Sent: Sunday, April 28, 2013 9:26 AM
To: materials-welding@googlegroups.com
Subject: [MW:17584] Difference between GMAW-S and GMAW-STT

Dear Experts,

Will we treat GMAW-Surface Tension Transfer (Lincoln Patented) mode exactly like GMAW-Short Circuit mode?

For GMAW (STT), welder can be not qualified on the basis of Radiography as per QW-304-ASME IX?

please comment.

Regards,

Ali Samdani

RE: [MW:17588] Pre heat requirements for tack welding in P91

Sir,

Thanks for your response. Can you give any reference for “if it delay not advisable to tack weld and keep for longtime. 2.5minutes/mm holding time ”

S.Binoy

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kannayeram gnanapandithan
Sent: Monday, April 29, 2013 10:59 AM
To: materials-welding
Subject: Re: [MW:17585] Pre heat requirements for tack welding in P91

1.yes,but it is not good practice to tack weld on the job. if u take full welding immediately after tack weld it is ok, if it delay not advisable to tack weld and keep for longtime. 2.5minutes/mm holding time

Pandithan

Welding Consultant

On Mon, Apr 29, 2013 at 11:56 AM, Lalu r p <lalucpt@gmail.com> wrote:

Dear Binoy

When I was working in a power project in India as per Client's Requirement for P91 joints we used to keep the joints on external clamps and weld directly after the proper preheating and purging.for tubes as well as pipes we followed the same method.Direct tack welding was not allowed by the client.Correct me if i am wrong.

Thanks &Regards

LALU R.P

On Sun, Apr 28, 2013 at 10:39 AM, Binoy Soman <binoy.spp@daelim.co.kr> wrote:

Dear Experts,

Regarding the subject mentioned, kindly clarify my following doubts.

(a) Preheating required for P91 as per B 31.1 is 200°C (mini). Does it mean that this Pre heat shall be given for tacking also.

(b) PWHT holding time for P91 mentioned in B 31.1 is 1 hr/25 mm; minimum 30 minutes. Does it mean that if the thickness is 6/10/12.5 mm the holding time is 30 minutes & for 15 ,20,30,40 mm the holding time is 36 48,72,96 minutes respectively.

(c) I got some special heating curves for P 91 from our group. But Kindly explain about the reference /standard used for preparation of this heat curve ( eg- why the preheat maintenance is 4 hours & again free cooling).

S.Binoy

[MW:17587] RE: 17584] Difference between GMAW-S and GMAW-STT

Dear sir,

We qualified welder by TPI For gmaw STT.

REGARDS

DINESH

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of M.A.Samdani
Sent: Sunday, April 28, 2013 6:26 PM
To: materials-welding@googlegroups.com
Subject: [MW:17584] Difference between GMAW-S and GMAW-STT

Dear Experts,

Will we treat GMAW-Surface Tension Transfer (Lincoln Patented) mode exactly like GMAW-Short Circuit mode?

For GMAW (STT), welder can be not qualified on the basis of Radiography as per QW-304-ASME IX?

please comment.

Regards,

Ali Samdani

Re: [MW:17585] Pre heat requirements for tack welding in P91

Pandithan

Welding Consultant

On Mon, Apr 29, 2013 at 11:56 AM, Lalu r p <lalucpt@gmail.com> wrote:

Dear Binoy

When I was working in a power project in India as per Client's Requirement for P91 joints we used to keep the joints on external clamps and weld directly after the proper preheating and purging.for tubes as well as pipes we followed the same method.Direct tack welding was not allowed by the client.Correct me if i am wrong.

Thanks &Regards
LALU R.P

On Sun, Apr 28, 2013 at 10:39 AM, Binoy Soman <binoy.spp@daelim.co.kr> wrote:

Dear Experts,

Regarding the subject mentioned, kindly clarify my following doubts.

(a)    Preheating required for P91 as per B 31.1 is 200°C (mini). Does it mean that this Pre heat shall be given for tacking also.

(b)   PWHT holding time for P91 mentioned in B 31.1 is 1 hr/25 mm; minimum 30 minutes. Does it mean that if the thickness is 6/10/12.5 mm the holding time is 30 minutes & for 15 ,20,30,40 mm the holding time is 36 48,72,96 minutes respectively.

(c)    I got some special heating curves for P 91 from our group. But Kindly explain about the reference /standard used for preparation of this heat curve ( eg- why the preheat maintenance is 4 hours & again free cooling).

S.Binoy

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Re: [MW:17586] WPS, PQR as per BS EN ISO 15614-1

Dear Ady loy,

Please find attached, may be useful for you.

Regards,

A Meganathan

----- Original Message -----

From: adyloy

To: materials-welding@googlegroups.com

Sent: Sunday, April 28, 2013 12:14 PM

Subject: [MW:17575] WPS, PQR as per BS EN ISO 15614-1

Anybody

Can anybody assist me to prepare or how to carry out WPS, PQR WQT as per BS EN ISO 15614-1

Material : SA 106 Grade B, Pipe : 6" OD Sch 80, Weld Process : GTAW+SMAW For Chill Water Project.

Pls furnish format if possible and requirement of Mech Test, NDT etc to qualify as per this standard.

Thanks & Rgds

Ady loy

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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:17583] Pre heat requirements for tack welding in P91

Dear Binoy

Thanks &Regards

LALU R.P

On Sun, Apr 28, 2013 at 10:39 AM, Binoy Soman <binoy.spp@daelim.co.kr> wrote:

Dear Experts,

Regarding the subject mentioned, kindly clarify my following doubts.

(a)    Preheating required for P91 as per B 31.1 is 200°C (mini). Does it mean that this Pre heat shall be given for tacking also.

(b)   PWHT holding time for P91 mentioned in B 31.1 is 1 hr/25 mm; minimum 30 minutes. Does it mean that if the thickness is 6/10/12.5 mm the holding time is 30 minutes & for 15 ,20,30,40 mm the holding time is 36 48,72,96 minutes respectively.

(c)    I got some special heating curves for P 91 from our group. But Kindly explain about the reference /standard used for preparation of this heat curve ( eg- why the preheat maintenance is 4 hours & again free cooling).

S.Binoy

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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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Sunday, April 28, 2013

[MW:17584] Difference between GMAW-S and GMAW-STT

Dear Experts,

Will we treat GMAW-Surface Tension Transfer (Lincoln Patented) mode exactly like GMAW-Short Circuit mode?

For GMAW (STT), welder can be not qualified on the basis of Radiography as per QW-304-ASME IX?

please comment.

Regards,

Ali Samdani

RE: [MW:17581] Hydrotest pressure criteria

The hydrotest requirements are given by the largest of:

a) Design standard requirements (ASME B31.3, ASME VIII, PD 5500, EN 13445, EN 13480, etc.

b) National pressure equipment regulations.

Older – now outdated - Danish regulations required 1.3 x design pressure.

ASME typically 1.5 x pd x (fy/fy,t) – fy: Design yield stress at room temperature, fy,t: Design yield stress at design temperature)

(pd is the design pressure)

The PED (Pressure Equipment Directive) in Europe as well as EN 13445 and EN 13480 reguire the largest of:

a) 1.43 x Design pressure

b) 1.25 x design pressure x (fy/fy,t). – fy and fy,t as above.

In Europe the PED requirements are now implemented in all national regulations.

regards

Kristian

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of nishant nair
Sent: 27. april 2013 13:02
To: materials-welding@googlegroups.com
Subject: [MW:17573] Hydrotest pressure criteria

Why hydrotest pressure is taken 1.3 times of design pressure? What is the criteria that fixes the term 1.5 times or 1.25 times, etc.???

Thanks in advance,
Nishant nair
Sent from Yahoo! Mail

Re: [MW:17582] Hydrotest pressure criteria

Hi avisek..
Thnx for reply.. but I wud like to further clarify my question. Its dat I want to know as wat is the base on which this 1.5 times or 1.25 times r fixed? Not in terms of new or old equipments but y 1.5 times.. y not 2 times or 1.4 times or 1.2 times. Y dey have fixed the values to that no. only.. wats d basis??
Well its written in code is not the answer m looking for..

Sent from Yahoo! Mail on Android

From: Avishek Dubey <avishek3889@gmail.com>;
To: <materials-welding@googlegroups.com>;
Subject: Re: [MW:17574] Hydrotest pressure criteria
Sent: Sun, Apr 28, 2013 7:22:22 AM

nishant when we conduct the hydro test for the first time we go for 1.5 times the rated pressure and there after we go for 1.2 times rated pressure

On Sat, Apr 27, 2013 at 4:32 PM, nishant nair <nishant852003@yahoo.com> wrote:

Why hydrotest pressure is taken 1.3 times of design pressure? What is the criteria that fixes the term 1.5 times or 1.25 times, etc.???

Thanks in advance,
Nishant nair
Sent from Yahoo! Mail

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Re: [MW:17574] Hydrotest pressure criteria

nishant when we conduct the hydro test for the first time we go for 1.5 times the rated pressure and there after we go for 1.2 times rated pressure

On Sat, Apr 27, 2013 at 4:32 PM, nishant nair <nishant852003@yahoo.com> wrote:

Why hydrotest pressure is taken 1.3 times of design pressure? What is the criteria that fixes the term 1.5 times or 1.25 times, etc.???

Thanks in advance,
Nishant nair
Sent from Yahoo! Mail

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[MW:17575] WPS, PQR as per BS EN ISO 15614-1

Anybody

Can anybody assist me to prepare or how to carry out WPS, PQR WQT as per BS EN ISO 15614-1

Material : SA 106 Grade B, Pipe : 6" OD Sch 80, Weld Process : GTAW+SMAW For Chill Water Project.

Pls furnish format if possible and requirement of Mech Test, NDT etc to qualify as per this standard.

Thanks & Rgds

Ady loy

Re: [MW:17575] Welding Position & Backing in PQR

Both are not essential variable for WPS.

On Fri, Apr 26, 2013 at 10:27 AM, Aly <mhaskar.aly@gmail.com> wrote:

Dear Friends,

Is welding position & backing is the criteria for PQR;

Can we use any position , with or without backing for PQR...and we don't have any restriction on above parameters

Kindly clarify as per ASME SEc IX

Ali

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail: biplab.mech@gmail.com

Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.

Re: [MW:17576] Use of other brands of filler & Flux combination for SAW welding than what brand used during PQR

You can subjected to other essential variables remain same.

On Fri, Apr 26, 2013 at 10:21 AM, Aly <mhaskar.aly@gmail.com> wrote:

Dear Friends

We have PQR with F7A8 EM12K from ESAB Brand ;

Can we use F7A8 EM12K from other Brands viz Bohler, Lincoln, Kiswel etc...

Is it acceptable as per SEC IX...

Ali Mhaskar

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Thanks & Regards
Biplab Pal
Welding Inspector

Re: [MW:17577] Hydrotest pressure criteria

What is your equipment?

On Sat, Apr 27, 2013 at 2:02 PM, nishant nair <nishant852003@yahoo.com> wrote:

Why hydrotest pressure is taken 1.3 times of design pressure? What is the criteria that fixes the term 1.5 times or 1.25 times, etc.???

Thanks in advance,
Nishant nair
Sent from Yahoo! Mail

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Thanks & Regards
Biplab Pal
Welding Inspector

Materials & Welding

Tuesday, April 30, 2013

[MW:17594] WPS for SA 335-P11 to 304 S.S. B31.1 criteria

[MW:17593] RE: 17592] welder is valid

[MW:17594] Re: Hydrotest pressure criteria

[MW:17596] Regarding Kereosene Leak test

Monday, April 29, 2013

Re: [MW:17590] WPS, PQR as per BS EN ISO 15614-1

[MW:17591] PWHT governing thickness B 31.3 (331.1.3)

[MW:17592] welder is valid

[MW:17589] RE: 17584] Difference between GMAW-S and GMAW-STT

RE: [MW:17588] Pre heat requirements for tack welding in P91

[MW:17587] RE: 17584] Difference between GMAW-S and GMAW-STT

Re: [MW:17585] Pre heat requirements for tack welding in P91

Re: [MW:17586] WPS, PQR as per BS EN ISO 15614-1

Re: [MW:17583] Pre heat requirements for tack welding in P91

Sunday, April 28, 2013

[MW:17584] Difference between GMAW-S and GMAW-STT

RE: [MW:17581] Hydrotest pressure criteria

Re: [MW:17582] Hydrotest pressure criteria

Re: [MW:17574] Hydrotest pressure criteria

[MW:17575] WPS, PQR as per BS EN ISO 15614-1

Re: [MW:17575] Welding Position & Backing in PQR

Re: [MW:17576] Use of other brands of filler & Flux combination for SAW welding than what brand used during PQR

Re: [MW:17577] Hydrotest pressure criteria

[MW:35346] Cast-iron welding

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