Hardfacing with O/A?

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Don't have any specific project in mind, but since hardfacing can be useful and I have a oxyacetylene welder I might as well ger some info on the subject and be ready if (or rather when) I want to try it. I'm interested in any useful info, so start writing if you know something... I've found some info in a old O/A welding handbook and on the web, details like that you should use a carburizing flame since the carbon added to the surface of the base material lowers the melting point. You should heat it until that thin surface layer begins to melt ( think "begins to sweat" would be a correctly translated quote) and then add hardfacing rod, ideally getting almost no mixing between rod and base material but still getting a very good bond. Would MMA hardfacing rods with the flux removed be acceptable? I know there are HF rods för O/A, but even if i could find it I would probably have to buy a ~5kg pack for a ridiculus price.
Reply:Depends, if the hard facing is iron based then the flux is needed. If it's cobalt or nickel/chrome then the flux is used for arc stability and can be removed.Matt(edit), The carburizing flame is very slight, I used to keep it less than a 3x feather.Last edited by Matt_Maguire; 02-22-2012 at 06:45 AM.
Reply:Okay, thanks.