1. Neutral flame (Equal vol.) Oxygen and Acetylene
2. Carburizing flame (Excess Acetylene)
3. Oxidizing flame (Excess Oxygen)

1. Neutral Flame: The proper mixture of oxygen and Acetylene is used for most welds.
2. Carburizing Flame: A low-temperature flame for touch brazing
3. Oxidizing Flame: This flame has excess oxygen. The flame does not wake a strong weld and as such always harmful.

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