AWS D1.1/D1.1M:2020 Thickness Transition Requirements Visit weldfabworld.com The transition of thickness requirement in AWS D1.1/D1.1M:2020 Structural Welding Code—Steel governs the geometry of butt joints connecting members of unequal thickness to mitigate stress concentrations, which are especially critical under cyclic or fatigue loading. While the requirement for an explicit tapered transition has been simplified or removed for some statically loaded non-tubular connections, connections subj