Slot Weld Sizing Calculator

Calculate slot weld dimensions, spacing, and shear capacity per AWS D1.1 for structural connections

Input Parameters

Results

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Min Slot Width
in
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Capacity per Slot
lb
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Min Slot Spacing
in
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Total Joint Capacity
lb
Note: Slot welds provide more shear area than plug welds. Per AWS D1.1, slot weld length must not exceed 10x the top plate thickness. Slots must have semicircular ends and be filled flush.

Reference

AWS D1.1 Section 2.4.5 Slot Weld Requirements: Min width: same as plug weld min diameter Max length: 10 x top plate thickness End shape: semicircular (radius = width/2) Min spacing: 4 x slot width (transverse), 2 x slot length (longitudinal) Shear area = rectangular area + semicircular ends