As per Code and Para UW-40,

I donot understand what is the defination of widest width of weld in case of 'double welded butt joints' and moreover how can we calculate HAZ ?

Please help me.

Regards
Osama

_________________
Syed Osama Nusrat Ali
Exective Engineering (Project)
Fauji Fertilizer Company Limited
Pakistan
email: osama_ali@ffc.com.pk
Cell # +92-3025252018

Osama,
Can you refer to your bit more specifically? UW-40 is 1.5 pages of text, it would be easier to help you when one knows where to read.

_________________
Konrad Anikiel

Dear Sir,

Its UW-40 Para (a). Page is 135

"The operation of PWHT ..................As a minimum, the soak ............. end of the weld."

The understanding which i need is, what does 'widest width of weld' mean and how can i make sure that if widest width of weld plus 1 t or 50 mm is the minimum distance required for PWHT and that it includes HAZ region also.

Best regards
Osama

_________________
Syed Osama Nusrat Ali
Exective Engineering (Project)
Fauji Fertilizer Company Limited
Pakistan
email: osama_ali@ffc.com.pk
Cell # +92-3025252018

Osama,
I would have thought that it is the width of the weld face, which you can measure with a vernier in the widest point. My understanding is that you need to include: weld (its max width) + HAZ(on both sides) + min(1t, 50mm) on both sides. If your HAZ is say 70mm and your thickness is 40mm, and your weld width is 55mm, then the minimum soak band is 40+70+55+70+40. Read also UW-40(f) for understanding what the "t" is.

_________________
Konrad Anikiel

Osama,

The "width of weld" literally means width of weld. See Figure 1 on the 3rd page of this article... http://www.wahchanglabs.com/pdf/1997/1997017.pdf
The figure shows a single v-groove weld, but the same concept applies to double groove weld joints. Just determine the largest width between the 2 weld faces of the double groove weld.

dr. chris

Konrad:

My understanding in your case, the minimum soak band is 40+55+40.

Tony

Tony, what about HAZ then?

_________________
Konrad Anikiel

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

_________________
Syed Osama Nusrat Ali
Exective Engineering (Project)
Fauji Fertilizer Company Limited
Pakistan
email: osama_ali@ffc.com.pk
Cell # +92-3025252018

Osama, you don't calculate the width of HAZ. You measure it. It depends on a number of welding and material parameters, so possibly there are empirical methods to predict it, but you can see with a naked eye where it ends. You can measure hardness of the material in few points, to demonstrate some evidence, but as far as an accord between the manufacturer and the AI goes, I don't think he would ever need it.

Reading UW-40 once more ensures me that HAZ is a separate part of the soak band and you have to include its width independently from weld width and the adjacent portion of metal.

_________________
Konrad Anikiel

Konrad

HAZ was included in 40

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

Dear Sir,

HAZ area near cannot be calculated and no worries as same is already included in soak band width.

Finally, soak band width = widest width + (1t or 50 mm) on both sides of weld.

Now suppose if we have a nozzle, after -> widest width + (1t or 50) , then nozzle weld (lower groove + fillet welding type ) PWHT may also reuse above dimension ( soak band width).

Lastly, what is your recommendation.... should we use min soak band width or should increase a little bit.

Osama

_________________
Syed Osama Nusrat Ali
Exective Engineering (Project)
Fauji Fertilizer Company Limited
Pakistan
email: osama_ali@ffc.com.pk
Cell # +92-3025252018

Tony, that's pretty much magic! can you please explain how did you manage to fit 70mm in 40mm or is it your secret?

_________________
Konrad Anikiel

Magic? No! the 70mm never exists.

Boys!!! You are making an easy think so difficult.
UW-40(a) starts in a sort of explanation of the why a certain band at each side of the weld shall be PWHT. Obviously the weld and the surrounding HAZ.
How to measure the HAZ in order o establish soak band with?
The answer follows: The soak band shall contain the weld and at each side a width equal to 1t (weld thk) or 2 in which ever is the less.
Assume to have a butt weld on material 70 mm thk and the weld top bead wide 30 mm you have to add to these 30 mm weld width, at each side, 1t or 2 inches whichever is the less: 2 in (50 mm) in this case. Then place T/C at the sides of the band wide 50+30+50 = 130, having centre of the weld top bead.
My comment: It is assumed the HAZ to be max. 1t or 2in wide.
Mauro

It never be difficult for me. By the way, how could you edit my post

Administration:
@TonyQ: your Post has been edited by Mauro Gonzaga who is the moderator of the Sec. VIII Forum. Probably he wanted to give you a quick respond... I will ask Mauro to send his own reply posts in order to avoid further confusion.