Matching/Undermatching Filler Metal Selector Calculator

Select matching or undermatching filler metal based on base metal strength, joint type, and loading per AWS D1.1 and AISC 360

Input Parameters

Results

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Matching Requirement
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Recommended FEXX
ksi
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Recommended Filler
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Undermatching Allowed
Note: Per AISC 360 Section J2.6, filler metal with a classification strength lower than the matching filler metal may be used for fillet welds and PJP groove welds connecting members where stress is not transferred.

Reference

AWS D1.1 / AISC 360 Filler Metal Matching Rules: CJP Groove + Tension: Matching REQUIRED (FEXX >= Fu) CJP Groove + Compression: Matching preferred, undermatch OK PJP Groove: Undermatching permitted Fillet Welds: Undermatching permitted (AISC 360 J2.6) Seismic (AISC 341): Demand-critical welds require matching + CVN AISC Table J2.5: Available weld strength = 0.60*FEXX for fillets