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RE: Charpy v notch toughness

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FEMA 353 is a recommendation for new standards, and is not the code until
the local jurisdiction decrees it to be so, or another standard (AWS, AISC)
incorporates something that the local jurisdiction references.

You must first meet the existing code, which is 20@-20 per several bodies
and 20@0 for others. Go with whomever governs your project. FEMA 353, in
essence,  recommends that those citing 20@-20 change to 20@0, but that has
not been done yet in most cases.

Don't forget the WPS / filler metal testing at service temperature in
Appendix A of FEMA 353. This is not addressed yet by most jurisdictions.

The colder the test temperature, the more difficult it is to achieve a
certain CVN toughness.

Bob Shaw
Steel Structures Technology Center, Inc.
www.steelstructures.com
24110 Meadowbrook Rd, Suite 104
Novi, MI 48375-3406
phone (248) 893-0132
fax (248) 893-0134


-----Original Message-----
From: PFFEI(--nospam--at)aol.com [mailto:PFFEI(--nospam--at)aol.com]
Sent: Friday, October 19, 2001 10:27 AM
To: seaint(--nospam--at)seaint.org
Subject: charpy v notch toughness


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.

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