One simply slams a larger atom or molecule into the target metal.
Martin

On 7/4/2011 5:03 PM, Bob Engelhardt wrote:
Steve B wrote:
Explain. CO2 will freeze skin coming out of a bottle. Mix might be
cold, but not that cold.

It's chemistry, not thermodynamics. Something along the lines of the CO2
being decomposed by the arc into C & O2, then the O2 reacting in the
weld zone to create more heat. Or maybe the C & O2 recombining. But
definitely chemistry. Note: no claim for more energy - the decomposition
& recomposition balance. It's how the energy is used.

Bob