[allmost]

I've yet to see steel that can do that. Bend, re bend with no loss of strength. I'm skeptical by nature but this pushes it. Let's see it.

[PugetSoundSoldier]

Spring steel, or a beryllium bearing alloy will do it. As long as you stay under the deformation limit in terms of stress, it will come right back to shape.

This could be a great way to do quick in-the-field changes of armor plating on tanks and vehicles, even hardened buildings.

[driftdiver]

theres already a method of temporarily joining two pieces of metal. its called welding and is used all the time