Cold welding

Hey kiddo, have you ever put two Lego pieces together and they just stick? That's called snapping or interlocking, right? But what if I told you two pieces of metal could stick together like that too, without any glue or anything? That's what we call cold welding.

Just like Lego blocks, when two pieces of metal are brought close enough, they can stick together. But unlike Lego blocks, metals can bond at the molecular level when they touch each other. It's like they become one piece instead of two separate pieces!

Now, remember how magnets attract each other and stick? It's a similar concept. Two metals attract each other and stick, but cold welding can only happen if certain conditions are met, like having a very clean surface and being in a vacuum (that's a special space where there's no air).

So kiddo, cold welding is basically the concept of two metals sticking together at the molecular level without any glue or heat involved, just like how magnets attract each other and stick.