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Re: charpy v notch toughness

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20 ft-lbs at minus (-)20 degrees Fahrenheight is the standard.
Yes, it is more difficult and challenging to obtain "V"-notch charpies 
at lower temperature than higher.

Pax e Gratia
Bob Ross
Robert P. Ross, P.E.
Principal Project Manager
Washington Group International,Inc.
Industrial Processes
17320 Red Hill, Suite 300
Irvine, Ca. 92614 
Mobile 562-254-4604
Office 949-222-3978
FAX 949-222-3985
E-mail: Bob.Ross(--nospam--at)WGINT.com

----- Original Message -----
From: Bruce Caro <bcaro(--nospam--at)stny.rr.com>
Date: Friday, October 19, 2001 4:11 pm
Subject: Re: charpy v notch toughness

> 
> 
> 
> At 10:26 AM 10/19/01 -0400, you wrote:
> >what is the correct standard requirement for charpy v notch 
> toughness for
> >weld material for full pen welds? A City of LA from 1997 and the 
> July 2000
> >FEMA 353 indicate 20 ft. lbs. @ 0 degrees F.  The current SEOC 
> Blue Book,
> >AISC Seismic Provisions, and an LA City Memo from May 2001 
> indicate 20 ft.
> >lbs @ -20 degrees F.  Electrode manufacturer spec seem to mainly 
> provide>specs that comply with the 20 ft lbs at -20 degrees.
> >
> >Is it more difficult to achieve a higher notch toughness at lower 
> or higher
> >temperatures.
> >
> >Thanks in advance
> >
> >paul franceschi s.e.
> 
> 
> 20 ft-lbs @ -20 F is common.
> Bigger ft-lbs @ lower temps means more $$$$
> Make sure it's a commercially available value whatever it is.
> Don't require 20 ft-lbs @ -25 F for example if 20 @ -20 F is standard.
> That would require $pecial testing and $pecial ordering and 
> $pecial $torage 
> etc.
> Try to make it possible to use what the fabricator has or can 
> easily get.
> Be flexible about it, if the shop has 20 ft-lbs @ -20 F wire and 
> the spec 
> says 20 ft-lbs  @ -25 F you'll make the job go better if you can 
> accept 
> what they have, especially since their estimator probably didn't 
> pick up 
> the "special order weld rod required " at the time of bid.
> (Do you hear the voice of experience ? )
> Talk to a welding equipment supplier and look at the bridge spec 
> used in 
> the area.
> 
> Bruce
> 
> 
> 
> 
> 
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