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The maximum beam-web thickness is a function of the maximum root opening and the angle of skew in a skewed single-plate connection. Why?Skewed Single-Plate Connection

in Steel Structures by  

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If the beam web becomes too thick relative to the skew angle, the root opening will begin to exceed 3/16 in This limit is the maximum root opening allowed by AWS for a fillet weld.
If the opening is 3/16 in. or less</strong>, the fillet weld size must be increased by the root opening dimension.
If the root opening provided by the unbeveled web or plate exceeds 3/16 in, the plate or web must be beveled.