bootleg the welders are right .... i had some 12inch xx heavy wall i did 2 repairs on it ,the third would be a cutout. the shear wave tech told me i missed both tries so i finally just went to the root and re welded it. so if in doubt just go all the way to the root. It was a piece half the size a grain of sand. i saw it right above the stringer. d1.1 also u never know how far a pin whole will go it could be worm hole porisity that tunnels though your previous weld bead, like with socket welds there a ***** to get out if u one pass them.. they just move around.