Cold Welding: Skinjo Draws a Bond Without a Flame

Cold welding: a seam without a flame

Skinjo draws the idea in two frames: clean metal faces approach; a solid-state bond joins them. No glowing pool, no melting—just a boundary that can become a bond.

The important word is clean. Oxide films and contamination usually keep metal surfaces apart. Under suitable conditions, sufficiently clean, compatible metal surfaces brought into intimate contact can bond without melting; pressure can help establish that contact. Ordinary metal objects do not automatically weld whenever they touch.

The diagram simplifies the process, not the conditions it requires. Cold welding is not cold fusion.

Source note: the supplied Wikipedia reference, “Cold welding,” itself asks for more citations. Treat this as a general introduction, not evidence for any particular spacecraft incident.

Reference: https://en.wikipedia.org/wiki/Cold_welding