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Friday, September 23, 2016

[MW:25444] Pre heat -Press. vessels

Dear Experts,

I would like to have a discussion regarding "pre- heating & its
mainatances" for aPressure vessel weldings ( ASME SEC. VIII DIV.1,
shell thickness -55mm & dish end -65mm, material SA 516 Gr.70, vessel
length -18mtr & ID-3mtr). WPS is calling for pre-heating of 100 deg.
C.(maintainace required for joints above 25 mm thickness) project
location - GCC.

Welding processes - LS & CS - SAW. Nozzles- SMAW.. since due to the
high ambient temp. of around 35-40 deg. & due to practical
difficulties, the welders could only maintain pre-heating while they
starting welding & not during the welding ( specially on the other
side of joints). the client insisting for continuous heating during
welding.

I want to request for the opinions from members how far pre-heat is
crucial in GCC environment especially in CS materials.

Thanks in advance,
Kumar

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Re: [MW:25443] 6GR Procedure Qualification - Does it cover CJP Butt Joints during production - WPS and NOT WELDER

Hi, Shashank,
Thanks for your feed back.

Do you mind sharing the code reference that permits me to do it.

I am  just referring to Table 4.1 AWS D1.1 2010 Ed. note d, which takes me to 3.12 and 3.13 and then again to 4.10, 4.13.1 and 4.13.2 and 4.13.4

Appreciate your thoughts on this,

regards
rudolf



From: 'Shashank Vagal' via Materials & Welding <materials-welding@googlegroups.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Friday, 23 September 2016, 11:19
Subject: Re: [MW:25442] 6GR Procedure Qualification - Does it cover CJP Butt Joints during production - WPS and NOT WELDER

Yes to all
 

Yours Truly,
Shashank C VAGAL




From: rudolf <rudolf.jude@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Thursday, 22 September 2016 9:11 PM
Subject: [MW:25441] 6GR Procedure Qualification - Does it cover CJP Butt Joints during production - WPS and NOT WELDER

Dear folks,

I have a procedure which was qualified, tested and accepted as follows.

1. Position of Test - 6GR
2. Pipe Used 6" Sch 120 and XXS
3. Process - FCAW
4. CJP as per sketch 4.25 CJP without any backing or backgouging.


Query.

Assuming that the welder is qualified, all other things are within control, thickness, etc etc,

1. Can I weld a Plate to Plate in CJP Butt Joint which does not have access to back gouging or back welding.

2. Can I have either a Single V or Single Bevel

3. Can I use ceramic backing


Appreciate your advise,

Regards
Rudolf
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Re: [MW:25442] 6GR Procedure Qualification - Does it cover CJP Butt Joints during production - WPS and NOT WELDER

Yes to all
 

Yours Truly,
Shashank C VAGAL




From: rudolf <rudolf.jude@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Thursday, 22 September 2016 9:11 PM
Subject: [MW:25441] 6GR Procedure Qualification - Does it cover CJP Butt Joints during production - WPS and NOT WELDER

Dear folks,

I have a procedure which was qualified, tested and accepted as follows.

1. Position of Test - 6GR
2. Pipe Used 6" Sch 120 and XXS
3. Process - FCAW
4. CJP as per sketch 4.25 CJP without any backing or backgouging.


Query.

Assuming that the welder is qualified, all other things are within control, thickness, etc etc,

1. Can I weld a Plate to Plate in CJP Butt Joint which does not have access to back gouging or back welding.

2. Can I have either a Single V or Single Bevel

3. Can I use ceramic backing


Appreciate your advise,

Regards
Rudolf
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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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Thursday, September 22, 2016

[MW:25441] 6GR Procedure Qualification - Does it cover CJP Butt Joints during production - WPS and NOT WELDER

Dear folks,

I have a procedure which was qualified, tested and accepted as follows.

1. Position of Test - 6GR
2. Pipe Used 6" Sch 120 and XXS
3. Process - FCAW
4. CJP as per sketch 4.25 CJP without any backing or backgouging.


Query.

Assuming that the welder is qualified, all other things are within control, thickness, etc etc,

1. Can I weld a Plate to Plate in CJP Butt Joint which does not have access to back gouging or back welding.

2. Can I have either a Single V or Single Bevel

3. Can I use ceramic backing


Appreciate your advise,

Regards
Rudolf

--
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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:25440] What is maximum limit for PWHT soaking temperature for P.No.1 Gr.1 & 2?

Sir what is the meaning of upper or lower transformation temperature

On Monday, 13 February 2012 09:26:05 UTC+5, manpreet singh wrote:
Hi,

ASME Sec Viii Div 1 UCS-56 only mandates min. PWHT temperature and even that can be reduced
further a bit by compensating more time per UCS-56.1

Max. PWHT temperature shall never exceed lower transformation temperature for below reason:-

Guessing that thickness of component would be more than 32mm or above so heat treatment
condition would be either Normalizing or Quenching and Tempering:-

For Normalizing:- component heat treated above Ac3 (upper critical temperature and cooled under
control to form Ferrite + Pearlite microstructure, PWHT is carried out to reduce residual
stresses produced during thermal changes but must be below Lower critical temperature not to
change the microstructure.

For Quenching and Tempering:- component heat treated above Ac3 and cooled in water/oil forming
martensite to gain better strength but with excessive hardness then tempering at below Ac1
(lower critical temp) to temper the martensite thus reduce hardness and increase ductility and
toughness.
PWHT temperature is generally kept below 30deg C below tempering not to alter properties
maintained however there would be slight decrease in strength and toughness, is the reason
often client require to simulate with test coupons of same heat treatment that PWHT does not
reduce mechanical properties below required.


Regards
Manpreet Singh



On Sat, 11 Feb 2012 09:13:17 +0530 wrote
>Dear Friends,minimum PWHT Soaking temperature is given in ASME Sec VIII Div. 1 UCS-56, My
question is What is maximum temperature that we can use for PWHT with reference to some
applicable standards or metallurgical point of view point?ORCan we do PWHT for P.No.1 Gr.1 & 2
(e.g SA 516 Gr. 60 & 70) maximum up to lower critical temperature i.e. 723 Degree Centigrade?
Thanks in Advance for your valuable share.



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