Practical Ideas for the Design Professional by Duane K. Miller, Sc.D., P.E.
Introduction A flat-faced, equal-legged fillet weld in a 90° T-joint has a theoretical throat dimension of 0.707 ω, where ω is the leg size (Figure 1). This assumes fusion is achieved to the root of the joint, but not necessarily beyond that point.
What Do the Codes Say?
Currently, the AWS D1.1-98 Structural Welding Code – Steel and the AASHTO/AWS D1.5-96 Bridge Welding Code do not account for penetration when determining fillet weld sizes. However, several codes do have provisions permitting reduced fillet weld sizes.
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