PROCEDURES FOR BRAZING
PIPE AND TUBING

Adjust torch flame. Oxygen/acetylene.

For most brazing jobs using oxygen-acetylene gases, a carburizing or neutral flame should be used. The neutral flame has a well defined inner cone. See diagram. The carburizing, or excess aceylene flame, removes surface oxides from the copper. The copper will appear bright rather than having a dull or blackened surface due to an improper oxidizing flame. Avoid an oxidizing flame.

Adjust torch flame. Air/acetylene using swirl combustion tips. Brazing with air/ acetylene torches is a popular alternative to oxygen mixed fuel gas. The fuel gas flow aspirates air into a mixer that contains an internal vane. The vane spins
the gas to improve combustion and increase flame temperature.