In welded steel connections, the effective throat thickness (t) of a fillet weld with leg size ‘s’ and fusion angle 90° is given by:
A0.50 s
B0.707 s (0.7 s)
C1.00 s
D1.414 s
Explanation
For a standard 90° fillet weld, throat thickness t = K * s = 0.7 * s.

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