D1.1 Code: Flare V Groove Weld Size

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I'm practicing for D1.1 CWI code test and this question has me stumped. "What is the effective size flare-V groove weld that the engineer can take credit for when two 3" bars are welded with GMAW the joint is filled flush?"According to Code Clinic workbook the answer is 1 1/8".  Referencing table 4.1Table 4.1 saysFlare-V Groove GMAW 3/4 RCan anyone explain how the answer 1 1/8" was calculated?
Reply:I've got it. R is the radius of the base metal.  Radius of 3" bar would 1 1/2". 1 1/2 x 3/4" = 1 1/8"