Oxygen gas is very capable of producing temperatures of 3000 C and 2800 C. Hence oxygen is required for oxy-hydrogen and oxy-acetylene blow torches. In addition, gas is widely uses in welding process. A high temperature flame is used to melt them by heating the junction. The ends are melted and solidify. Industry produce oxygen gas with oxygen producing plant.
"The Ol' Joint Jigger is a must have for any metal fabrication shop. It is quite capable and efficiently cuts through up to 1-1/2" sch 80 extra heavy duty pipe providing precision copes through a wide range of angles. I recommend the use of a high quality bi-metal bit and copious amounts of cutting oil. The cheaper imitations are exactly that. This is a quality tool." -rFab1227 from KS