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Argon is a better insulator than air so i doubt it is an instrinsic property of the gas that is cooling the weld better than the surrounding atmosphere. The argon flow might be cooler than the surrounding atmosphere as it is decompressed from the bottle...
My guess would be the non-reactivity of the Argon being the driver for the nice clean welds.
fidbod
That welding looks incredibly clean almost no tarnishing what so ever.
Is this all because of the inert nature argon or the fact that the argon is cooling the weld quicker reducing oxidation.
It seems to be a shame to paint it
Can I ask about the tubing is 853 main triangle and columbus and deda rear stays? This option seems to me popular amongst framebuilders but may I ask why?