At what rail temperature is thermite welding prohibited?

Thermite welding is a process that generates extremely high temperatures through an exothermic reaction, allowing for the fusion of metal surfaces. However, it is crucial to consider the temperature of the rail before performing this process, as it impacts the quality of the weld and the safety of the operation.

Thermite welding is prohibited at 0 degrees Fahrenheit because, at lower temperatures, the metal becomes more brittle and the properties of the materials can change adversely. This can result in poor weld integrity and may lead to cracking or other failures in the weld joint. It is essential for the rail to be above this threshold to ensure proper fusion and achieve a strong and reliable connection.

In terms of the context of the other temperature options, temperatures higher than 0 degrees Fahrenheit are generally more conducive to effective thermite welding, as they ensure that the metal remains ductile and enables a better chemical reaction during the welding process.