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Notch Tough Welding Metal

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A while ago, I attended an AISC seminar in the midwest where I believe one 
of the speakers talked about modifying the typical flange bevel weld used 
for beam to column moment connections. I believe some of the 
recommendations came out of the research conducted after the Northridge 
earthquake. If I understood him correctly, one of the recommendations was 
to use notch tough weld metal (minimum 20 ft-lbs at -20 degrees F) even in 
non-earthquake country.

What does this mean to a fabricator? Does he have order special welding 
rods to meet this requirement? Are their special welding procedures also?

Jim K.

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