T-Joint Fillet Weld Sizing Calculator

Calculate fillet weld size, throat, and capacity for T-joint connections per AWS D1.1 structural welding code

Input Parameters

Results

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Minimum Fillet Size
in
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Required Fillet for Load
in
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Effective Throat
in
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Joint Capacity
lb
Note: T-joints are one of the most common structural weld joints. Always weld both sides of the web unless design specifies otherwise. Lamellar tearing is a concern in thick flanges - consider through-thickness (Z-direction) testing for critical T-joints.

Reference

AWS D1.1 T-Joint Fillet Weld Design: Two fillet welds (one each side of web) Throat = 0.707 x fillet size Capacity = 2 x 0.30 x FEXX x throat x length Min fillet per Table 5.8 based on thicker member Max fillet size = web thickness Required fillet = Load / (2 x 0.30 x FEXX x 0.707 x L)