Final answer:
The CSA W59 standard specifies that the maximum allowable depth of undercut for a weld under cyclic loading where the load direction is transverse to the undercut is 0.5 mm.
Step-by-step explanation:
The subject of the question is related to CSA W59 welding standards, specifically the allowable depth of undercut in welds subject to cyclic loading. CSA W59 is a standard referenced in welding practices that all professional welders and engineers working with welded structures must adhere to, especially when considering the strength and durability of the weld joint against cyclical loads, such as vibration or changes in load direction.
For a weld under cyclic loading where the load direction is transverse to the undercut, CSA W59 specifies that the maximum allowable depth of undercut is 0.5 mm. It's important to conform to this specification to ensure the structural integrity of the weld, as undercut can act as a stress concentrator and potentially lead to fatigue failure.