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larger odd 16 in. (or even mm), nor larger than 2 times the thickness of the weld. The spacing of lines of slot welds in a direction transverse to their length shall not be less than four times the width of the slot. The centertocenter spacing of two slot welds on any line in the longitudinal direction shall not be less than two times the length of the slot. The thickness of a slot weld in material less than  in. (16 mm) thick shall be equal to the thickness of the material. In material over  in. (16 mm) thick, the thickness of the weld shall be at least onehalf the thickness of the material but not less than  in. (16 mm).
For fillet welds, the following size and length limitations apply:
• Minimum leg size. The minimum leg size is given in Table 4.20.
• Maximum leg size. Along the edge of a connected part less than 1 in. (6 mm) thickness, the maximum leg size is equal to the thickness of the connected part. For thicker parts, the maximum leg size is t minus 16 in. (2 mm), where t is the thickness of the part.
• Length limitations. The minimum effective length of a fillet weld is four times its nominal size. If a shorter length is used, the leg size of the weld shall be taken as 4 in. (6 mm) its effective length for the purpose ofstress computation. The effective length ofendloaded fillet welds with a length up to 100 times the leg dimension can be set equal to the actual length. If the length exceeds 100 times the weld size, the effective length shall be taken as the actual length multiplied by a reduction factor given by [1.2 — 0.002(L/w)] < 1.0, where L is the actual length of the endloaded fillet weld, and w is the leg size. The length of longitudinal fillet welds used alone for flat bar tension members shall not be less than the perpendicular distance between the welds. The effective length of any segment of an intermittent fillet weld shall not be less than four times the weld size or 11 in. (38 mm).
TABLE 4.20 Minimum Leg Size of Fillet Welds
Thickness of thicker part joined, t (in.)
Minimum leg size (in.)
TABLE 4.20 Minimum Leg Size of Fillet Welds
Thickness of thicker part joined, t (in.)
Minimum leg size (in.)

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