Widest Width of Weld + HAZ Calcs as per UW-40

akonrad · **Posted:** Mon Apr 27, 2009 10:44 am

Tony, don't you think there are 3 zones defined:

As a minimum, the soak band shall contain
1. the weld, (to be measured with a vernier)
2. heat affected zone, (to be measured as well)
3. and a portion of metal adjacent (defined in the next sentence as w+min(1t,2in))

They are divided in the text by commas, so they are separate definitions and they have to be counted with no overlapping!

Having said this, I never had to interpret this in any actual job, so it's just my 3 cents, not coming from any experience. There is no official interpretation on this. Any more opinions from other sofers :-)

?

TONYQ · **Posted:** Mon Apr 27, 2009 3:41 pm

akonrad wrote:

Tony, don't you think there are 3 zones defined:

As a minimum, the soak band shall contain
1. the weld, (to be measured with a vernier)
2. heat affected zone, (to be measured as well)
3. and a portion of metal adjacent (defined in the next sentence as w+min(1t,2in))

They are divided in the text by commas, so they are separate definitions and they have to be counted with no overlapping!

Having said this, I never had to interpret this in any actual job, so it's just my 3 cents, not coming from any experience. There is no official interpretation on this. Any more opinions from other sofers :-)

?

Konrad

I really don't know how to let you understand the Word "Volume" there after that comma means the total Soak band not the portion of the metal adjacent. You misunderstood for sure.

Let's stop this topic here, Thanks.

Tony

akonrad · **Posted:** Mon Apr 27, 2009 3:56 pm

OK, I was just under impression that you are able do defend your story with something more than just your beliefs :-)

But I do understand that people make thing this way or that way and they not always know why.

PS I think it would be worthwile to send a request for interpretation if anyone really needs to use UW-40. Anyone taking bets?

TONYQ · **Posted:** Mon Apr 27, 2009 4:28 pm

I prefer to bet that everybody here has known why now after above discussing except you

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

Dear Sirs,

I am now clear in most of my questions regarding UW 40(a) and HAZ region .

However to just finalize in real time, i have attached my exchanger drawing and its particular part for final decision.

Please comment and help me satisfying my design so that i can be confident before its fabrication (as you all are of great help).

Thank you in advance to take part in my this design issue and fabrication drawings.

Best regards
Osama

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

TONYQ wrote:

Osama wrote:

Dear Sirs,

Widest width is the widest width of the weld face in case of double V weld butt joints. Concept clear.

But now I m bit confused with total width of soak band.

According to Konrad, it is equal to Widest width of weld face + 2 x HAZ + 2 X thickness on each side.

According to Dr Chris, it is equal to Widest width of weld face + multiple of thicknesses on each side..

And according to Tony, it is equal to Widest width of weld face + 2 x thickness on each side..

In addition to above clarification, I am also interested if anyone could tell me, the calculation of HAZ with respect to double V or Single V butt weld joints.

Thanks to all of you and taking so much care of my comments.

Waiting for final agreement on soak band width and HAZ region / distance calculation on both sides of welds.

Regards
Osama

Osama

Per Code, The minimum width of this volume (here means the volume of soak band) is the widest width of weld plus 1t or 2" (50mm) whichever is less, on both side.
HAZ+the portion of base metal adjacent to the weld<=the lessor of 1t or 2".

Tony

Sorry Tony, now I understand what I did. Being the moderator I have two options on the bottom left corner. "Edit" and "Quote". I pressed edit instead of quote. Regards. Mauro

TONYQ · **Posted:** Fri May 01, 2009 9:28 pm

Tony[/quote]

Sorry Tony, now I understand what I did. Being the moderator I have two options on the bottom left corner. "Edit" and "Quote". I pressed edit instead of quote. Regards. Mauro[/quote]

Hi Mauro,

Not at all. I was just wondering why. No I see. Thank you for letting me know.

Have a great weekend

Tony

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

Dear all concerned,
Instead clarifying each other on editing actual post, can anyone clear me u, my last post i.e. Post 19. Simply I have to confirm that same volume which acc to UW-40 a can be considered for the soak band requirement of a nozzle adjacent to circumferential joint.

Pls answer as soon as possible.

Osama from Pakistan

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

Osama wrote:

Dear all concerned,
Instead clarifying each other on editing actual post, can anyone clear me u, my last post i.e. Post 19. Simply I have to confirm that same volume which acc to UW-40 a can be considered for the soak band requirement of a nozzle adjacent to circumferential joint.

Pls answer as soon as possible.

Osama from Pakistan

Keep cool Obama. It is not the maximum of politeness to ask other's advice in this way.
I didn't answer to your last post with the dwg. because I can't read the dwg. Too low quality. However maybe I understand what is your problem: the edge of the circumferential weld to be PWHT is closer to nozzle or main flanges than 1t or 2 in (whichever is the less). I can only read the Code in UW-40 and I interpret that if this is the case the band to be PWHT shall contain the nozzle or the main flange as well. If this is the case, to avoid it, you have to design the circ. weld more distant and/or be able to weld with a narrow gap.
Mauro

Osama · **Joined:** Thu Apr 02, 2009 9:38 am **Posts:** 59

Dear Mauro,

First of all sorry for being in polite.

However Sir, I m pretty confident now. But still to make more clear in words and to make it compliance with code / as per UW-40(a), i have attached same file in word format.

Link is here under:
http://www.filefactory.com/file/agfg6dd ... icture_doc

Waiting for your kind reply, as my design is to be finalized.

Regards
Osama..

Widest Width of Weld + HAZ Calcs as per UW-40

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