Shear flow is used to calculate fastener spacings, glue strength, or design welds to create composite sections from smaller components. It's calculated as Shear Flow (q) = Applied Shear (V) * First Moment of Area (Q) / the Composite Section's Moment of Inertia (I).
After a little more discussion of shear flow and its uses, I show three examples of calculating it in an I-beam.
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