Intermittent Fillet Weld Schedule (AISC J2 / AWS)
When a required continuous fillet is smaller than the practical minimum weld, sizes the intermittent (stitch) schedule that matches it: weld a fraction w_req/w of the length at the larger stitch size, pitch = increment / fraction, each increment at least the greater of 4 x the weld size or 1.5 in (AISC 360 J2.2b). A 3/16 in required weld done as 5/16 in stitches means welding 60% of the length; a 3 in increment gives a 5 in pitch (weld 3, skip 2) and clears the 1.5 in minimum. Maximum spacing and end returns are separate checks. A design aid, not a substitute for the engineer of record.
Formula and source
fraction = w_req / w_intermit; pitch = increment / fraction; min_increment = max(4 x w_intermit, 1.5 in); ok = increment >= min_increment.
AISC 360 §J2.2b (intermittent fillet welds, minimum length) and AWS D1.1 Structural Welding Code - Steel, by name.
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