Re: melting with an "oxidizing-reducing" atmosphere?


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Posted by Jack on June 02, 1999 at 06:02:41:

In Reply to: melting with an posted by Rob Frink on May 31, 1999 at 12:43:08:

The green flame is from an oxidating fire. I have it when another furnace on the same gas supply line cycles, and creates a pressure change in the line thus pushing out more gas on my already regulated one. I have had little problem with it as my oxidating flame comes and goes with the cycles. As this only happens when I have extra gas pressure coming on, I would say that maybe you are rushing your furnaces capability as the flame is being forced out of the flue. By turning my gas down a little it disappears, but turning up the air only forces it out more. You might have some bad metal with elements that tend to gas. I often have a very bright yellow coloring in my investment casts in the porous areas of the stuccos. It seems to fade a lot as the investment cools. I haven't got an answered description of it yet, but can assume that it is either a slight metal impurity or that my gasing problem is minor. Either way, the problem seems to leave the casting unharmed.

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