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Fillet Weld
A weld that joins two surfaces meeting at approximately 90 degrees without joint preparation. Fillet weld strength is determined by the weld leg size and throat dimension and is the most common weld type in structural fabrication.
Fillet welds dominate structural fabrication because they require no joint preparation, simply two surfaces meeting at roughly 90 degrees, and they develop strength through the effective throat dimension, which is determined by multiplying the weld leg size by 0.707. The weld leg, measured from each surface corner to the farthest point of fusion, must be consistently achieved pass after pass; undersized fillet welds create premature fatigue failures in cyclic loading applications.
Our welding operations carefully control fillet dimensions through proper travel speed, arc length, and work angle to ensure weld certification compliance with AWS standards. Fillet welds on both sides of a lap joint or T-joint distribute stress more evenly and provide better fatigue performance than single-sided applications.
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