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ASME B31.3-2016 <br /> Fig. 328.5.2A Fillet Weld Size <br /> Surface of perpendicular member S;Con;vex <br /> f of perpendicular member <br /> Convex fillet weld Size of Concave <br /> fillet weld Concave <br /> Size of `meld fillet weld fillet weld <br /> Surface of Surface of <br /> weld horizontal member horizontal member <br /> Theoretical throat <br /> Theoretical throat <br /> Equal Leg Fillet Weld Unequal Leg Fillet Weld <br /> GENERAL NOTE: The size of an equal leg fillet weld is the leg GENERAL NOTE: The size of unequal leg fillet weld is the leg <br /> length of the largest inscribed isosceles right triangle (theoretical lengths of the largest right triangle which can be inscribed <br /> throat = 0.707 x size). within the weld cross section [e.g., 13 mm x 19 mm (1/Z in. <br /> x 3/4 in.)]. <br /> Fig. 328.5.2B Typical Details for Double-Welded Slip-On and Socket Welding Flange Attachment Welds <br /> �{ xmin. xmin. xmin. P1.5 <br /> '� xmin. <br /> xmin. xmin. xmin. xmin. <br /> mm(1/16 in.) <br /> approx.gap <br /> The lesser of Tor 6 mm(1/4 in.) before welding <br /> (1) Front and Back Welds (2) Face and Back Welds (3)Socket Welding Flange <br /> X, = the lesser of 1.47Tor the thickness of the hub <br /> Fig. 328.5.2C Minimum Welding Dimensions for Socket Welding Components Other Than Flanges <br /> T.=nominal pipe wall thickness <br /> CX I I <br /> ME <br /> CX(min.)= 1.09 T,n,or the thickness <br /> of the socket wall, <br /> CX whichever is smaller <br /> Approximately 1.5 mm (1/16 in.)gap <br /> before welding <br /> Socket wall thickness <br />