Just an FYI since I'm not positive about D1.1, but the AWS Bridge Code D1.5 specs a max of 1/2" for single pass, multiple electrode, horizontal fillet weld.
CWB W47.1 5\16 is the max.pre qual. fillet size.I thought AWS D11 was the same but if im reading table 3.7 correctly the max pre qual.is 1\2'' would like to get comfermation if possible.