The Orgo Head Repair process specifies that 2" of the railhead must be completely removed down to which section of the web?

The correct answer specifies that 2 inches of the railhead must be completely removed down to a depth of 1 inch into the web. This requirement is based on ensuring that adequate material is removed to allow for proper fusion of the thermite weld.

When the railhead is heated and welded, the joint must have a clean and sufficient depth to promote optimal bonding between the rail sections. Removing 2 inches of the railhead down to 1 inch ensures that any brittle or damaged material, as well as dirt and oxides, that may hinder weld quality are effectively eliminated.

This depth is critical because it balances the need for a robust weld while avoiding excessive removal of material that could weaken the rail structure. The thermal dynamics involved in the thermite welding process require this specific depth to ensure that the molten thermite fully penetrates and interacts with the exposed surfaces, thus creating a strong and stable joint.

In contrast, other depths such as 1/2 inch, 1-1/2 inches, or 2 inches either do not provide enough exposure for effective welding or may risk compromising the integrity of the adjacent rail material.