Fillet Weld - Throat Thickness Rule

Required fillet-weld leg length for a double-continuous weld on shell/bulkhead stiffeners per IACS UR W7 / class rule factor of parent-plate thickness.

WeldingFilletScantling

Parent plate thicknessmmWeld factor f

Fillet leg length: 4.2mm

Throat thickness: 3.0mm

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Formula, assumptions, and limits

a = f \cdot t, \quad t_a = 0.707 \cdot a

Symbol	Meaning	Unit
$t$	Parent plate thickness	mm
$f$	Weld factor

Source: IACS UR W7 / CSR Pt2 Ch2

In short

Required fillet-weld leg length for a double-continuous weld on shell/bulkhead stiffeners per IACS UR W7 / class rule factor of parent-plate thickness.

Learn the theory Hull Strength and Longitudinal Bending