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Proper Flame. A neutral flame (fig. 13) is used for almost all
gas welding. The oxy-acetylene flame consumes all oxygen in
the air around the welding area, which leaves an uncontami-
nated weld area and a weld of maximum strength. An oxidiz-
ing flame is rarely used, but a carburizing flame is occasionally
helpful when flame hardening or brazing.
fig. 13
Various Acetylene Welding Flames
Inner White Cone
No Acetylene Feather
Nearly Colorless
Inner White Cone
Bluish to Orange
Inner Cone
Acetylene Feather
shrill hissing sound caused by the flame burning inside the
mixer area.), turn off the oxygen valve immediately and
then the fuel valve. Follow the shut down procedures on
page 14. Allow the equipment to cool off before attempting to
reuse. If the problem reoccurs, bring the equipment to a
qualified repair technician.
Nearly Colorless
White
If you experience a backfire or flashback (a
13
Pure Acetylene Flame
Neutral Flame
Bluish to Orange
Oxidizing Flame
Carburizing Flame
Light Orange
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