How many inches of rail flow need to be ground from the rail end prior to performing a weld on curve worn rail?

Before performing a weld on curve-worn rail, it is essential to prepare the rail end properly. Grinding a specific amount of rail flow is crucial for ensuring that the thermite weld has the best chance of success. The correct choice is based on established practices that indicate a proper amount of material needs to be removed to ensure good joint alignment and proper penetration during the welding process.

Grinding 12 inches of rail flow from the end of the rail allows for the removal of any surface irregularities and the worn-out areas that could compromise the integrity of the weld. This preparation helps achieve a surface that can accept the molten thermite metal effectively, leading to a strong bond that withstands the operational stresses of the rail.

Other options suggest different amounts of rail flow to be ground, which may not provide sufficient surface area for effective welding, potentially leading to weak joints or weld failures. Proper preparation is a fundamental aspect of successful thermite welding, highlighting the importance of the 12-inch grinding requirement.