Cold welding: https://en.wikipedia.org/wiki/Cold_welding https://en.wikipedia.org/wiki/Cold_welding "Autonomous healing of fatigue cracks via cold welding" (20

Cold welding: https://en.wikipedia.org/wiki/Cold_welding https://en.wikipedia.org/wiki/Cold_welding "Autonomous healing of fatigue cracks via cold welding" (2023) https://www.nature.com/articles/s41586-023-06223-0 https://www.nature.com/articles/s41586-023-06223-0 : > [...] However, unexpectedly, cracks were also observed to heal by a process that can be described as crack flank cold welding induced by a combination of local stress state and grain boundary migration. The premise that fatigue cracks can autonomously heal in metals through local interaction with microstructural features challenges the most fundamental theories on how engineers design and evaluate fatigue life in structural materials. We discuss the implications for fatigue in a variety of service environments. .. https://www.agriculture.com/machinery/maintenance--repair/impressive-strength-of-cold-weld-putty_567-ar51299 https://www.agriculture.com/machinery/maintenance--repair/im... : > Cold weld is a common – although incorrect – term used to describe the process of using filled epoxy glue to repair broken metal machinery components. The product is a combination of a plastic resin compound and finely powdered steel. A catalyst, or hardener, is added to this mixture to cause a chemical reaction, which hardens the putty into a solid mass .. Cold spraying: https://en.wikipedia.org/wiki/Cold_spraying https://en.wikipedia.org/wiki/Cold_spraying