What is the maximum depth of undercut allowed in the solid section of the bar or structural member?

The maximum depth of undercut allowed in the solid section of a bar or structural member is crucial for maintaining the integrity and strength of the welded joint. An undercut occurs when the base metal adjacent to the weld pool is melted away, leading to a groove or notch that can weaken the material.

A depth of 1/32" for undercuts is typically specified as the allowable limit because this dimension ensures that the structural integrity is not compromised. Exceeding this limit could introduce stress concentrations that may lead to premature failure during service, especially under dynamic loading conditions. Thus, adhering to the specified maximum depth helps maintain strength and reliability in welded structures, ensuring that they perform safely over time.

The other options present depths much larger than 1/32", which would not align with industry standards intended to ensure weld quality and the structural performance of the joint after fabrication.