How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain

Atomic hydrogen atoms, produced by dissociation of dihydrogen with the help of an electric arc, are allowed to recombine on the surface to be welded. In this process, a large amount of energy is liberated which is used to generate a temperature of 4000 K for cutting and welding purpose in the form of atomic hydrogen or oxy-hydrogen torches.