When is it necessary to maintain a restriction on train traffic at weld locations?

Maintaining a restriction on train traffic at weld locations is essential for safety during the thermite welding process from ignition until the molten metal pours. This is a critical period where the temperatures involved in the welding process can affect not only the immediate area but also surrounding structures and the safety of personnel working nearby.

During ignition, the thermite reaction begins, producing intense heat, which can create hazards if train traffic is allowed too close. As the reaction progresses and the molten metal begins to form, there is a risk of splatter or spillage, which could be dangerous. Allowing trains to operate near this area during these stages could lead to catastrophic accidents, injuries, or damage, should anything go awry with the welding process.

In contrast, there are phases, such as after the head riser is removed or during mold installation, where maintaining a restriction may be less critical or applicable. The primary safety concern centers around the active thermal reaction and the handling of molten material, making it imperative to restrict train traffic during this period for the protection of all involved.