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charpy v notch toughness

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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 

Thanks in advance

paul franceschi s.e. 

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