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Max weld size

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My question is this.
When placing a fillet weld on both sides of the same plate (such as a shear
tab to column or HSS brace to gusset plate)  I have run across two formulas
to determine the max. allowable fillet weld size for a given thickness of
1. D=t*Fy/5.16, Where D is in 16th's. (LRFD manual Vol. II, AISC)
2. D=.75t  Where D is in inches.(The Procedure Handbook of Arc Welding,
Lincoln Electric)
Are both formulas valid?
I believe #2 is meant as a quick approximation, but was just wondering if
anybody has used these formulas.  The answers very greatly depending on
plate strength. Also does anybody know how #1 is derived?
Mark Harper PE, SE
Phone: (626) 564-2820
Fax: (626) 564-2873