In the vacuum, two clean pieces of metal, can WELD spontaneously, just by touching each other. In solid metals, atoms naturally move a little, so without oxygen or other elements oxidizing the surfaces, atoms will "think" to be moving inside the same obje

In the vacuum, two clean pieces of metal, can WELD spontaneously, just by touching each other. In solid metals, atoms naturally move a little, so without oxygen or other elements oxidizing the surfaces, atoms will "think" to be moving inside the same obje