Rich Waugh
Platinum Member
The coefficient of thermal expansion of steel is fairly low so it takes a LOT of heat to make meaningful change - the hair dryer won't do it, I'm afraid.
Where heat really works well on frozen rusted parts is when you can heat things up to a low red heat using a reducing flame from an oxy/fuel torch. At that heat and with the extra carbon from a reducing flame, the rust, Fe2O3 is converted back to Fe+CO2, if I remember my chemistry correctly. Now those huge rust molecules are shrunk back down to their original size and things free up. :thumbsup:
The other advantage to using the O/A torch is that if things don't free right up you can just go ahead and hit the lever for the cutting jet and away it goes!:laughing:
Where heat really works well on frozen rusted parts is when you can heat things up to a low red heat using a reducing flame from an oxy/fuel torch. At that heat and with the extra carbon from a reducing flame, the rust, Fe2O3 is converted back to Fe+CO2, if I remember my chemistry correctly. Now those huge rust molecules are shrunk back down to their original size and things free up. :thumbsup:
The other advantage to using the O/A torch is that if things don't free right up you can just go ahead and hit the lever for the cutting jet and away it goes!:laughing: