What is the minimum temperature the base of the rail should be heated to in degrees Fahrenheit?

The minimum temperature that the base of the rail should be heated to in order to ensure proper thermite welding is 450 degrees Fahrenheit. This temperature is significant because it helps to create the optimal conditions for the thermite reaction and promotes effective fusion of the metal. Heating the rail to this temperature helps to reduce the thermal shock that can occur when the molten thermite is poured onto the workpieces, ensuring a better bond by allowing both the base metal and the thermite to properly flow and integrate at the joint.

Properly reaching this temperature assists in avoiding issues such as incomplete melting or insufficient bonding, which can undermine the integrity of the weld. Achieving and maintaining this heat level ensures that the overall welding process runs smoothly, leading to a strong and durable weld that can withstand the stresses and strains of service. Higher temperatures could still be effective, but 450 degrees Fahrenheit is considered the minimum threshold for guaranteeing a successful thermite weld.