When burned with oxygen, this gas, C2H2, burns so hot it can weld iron & cut steel
it is also very brittle when hot, so cracking in 
the heat... [DOC] [TLE] Fundamentals of Gas Cutting and Welding - CED Engineering [PAR] bring any of the so-called commercial metals, namely: cast iron, steel, copper, 
and ... uses acetylene and oxygen to preheat metal to red hot and then uses pure 
oxygen to burn ...