Where should the ground lead be clamped when arc welding on the structural steel frame of an overhead crane?

When arc welding on the structural steel frame of an overhead crane, the ground lead should be clamped to the structural member on which you are welding. This is crucial because it ensures a direct and efficient path for the electrical current during the welding process.

Clamping the ground lead directly to the structural member ensures that the welding arc is stable and that the current flows smoothly through the piece being welded. This minimizes the risk of voltage drop and potential electrical hazards, which can occur if the ground is not securely connected to the workpiece. A poor ground connection could compromise the quality of the weld and may even pose safety risks such as electrical shock or fires.

While other options involve components of the crane, they do not offer the same level of effectiveness as grounding directly on the welded part, as they might lead to inefficiencies and potential safety concerns.