What is the maximum weld reinforcement for a cyclically loaded structure greater than 2"?

In the context of the AWS D1.1 Structural Welding Code, the maximum weld reinforcement for a cyclically loaded structure greater than 2 inches is specified to ensure that the welds can adequately handle the dynamic loads without introducing stress concentrations or potential failure points. The specification limits the amount of excess material that can be present beyond the size of the weld to minimize the risk of fatigue cracking, which is a critical concern in structures subject to repeated loading.

The choice of 3/16" as the allowable maximum reinforcement strikes a balance between providing enough material for strength and minimizing the potential for adverse effects during the service life of the structure. Reinforcements greater than this could lead to increased stress concentrations, which can be detrimental under cyclic loading conditions. Therefore, adhering to this maximum limit is essential for maintaining the integrity and performance of welded connections in dynamically loaded applications.