Thanks,
But I am not designing these flanges as per Skecth (2) that is a loose type of flange design procedure.
I am considering the intergral flange design calculation that is Sketch(7) of sheet 1, as mention in sheet 2, general notes b). for sheet 3 Flange design there are mutilpe slopes involed which includes a weld, then a zero slope due to rolled pale and fiuther at the end we have another slope due to weld.

I hope you have understtod my point.