They may be referring to ‘cold welding’. Oxygen lets metals ‘remember’ what they are connected to. References: - https://en.wikipedia.org/wiki/Cold_welding htt

They may be referring to ‘cold welding’. Oxygen lets metals ‘remember’ what they are connected to. References: - https://en.wikipedia.org/wiki/Cold_welding https://en.wikipedia.org/wiki/Cold_welding - https://youtube.com/watch?v=Y2nQ8isf55s https://youtube.com/watch?v=Y2nQ8isf55s