Question

Cold welding is the process of joining metals using pristine surfaces without contaminents(oxide layers, oil, dust...) using pressure through atomic diffusion between the metal joints. Why does this process not work with carbon alloys such as stainless steel?

Answer 1

Cold welding does not work with carbon alloys like stainless steel due to the presence of chromium, which forms a protective oxide layer that hinders atomic diffusion.

Step-by-step explanation:

Cold welding is the process of joining metals using pristine surfaces without contaminants such as oxide layers, oil, or dust, through atomic diffusion between the metal joints. This process does not work with carbon alloys such as stainless steel because these alloys contain a small amount of chromium, which tends to collect near the surface and form a passivating oxide layer that protects the iron. This oxide layer interferes with the atomic diffusion required for cold welding, preventing the process from being effective.