Oxidizing and reducing flames
- Oxidizing and reducing flames
: leftmost: reducing flame, rightmost: oxidizing flame
Oxygen rich butane
Fuel rich butane torch flame
In various burners, the oxidizing flame is a flame produced with an excessive amount of oxygen. A flame with a good balance of oxygen is clear blue. When the amount of oxygen increases, the color darkens, the flame shortens, and it hisses and roars. With some exceptions (e.g., soldering of platinum, in jewelry), the oxidizing flame is undesirable in welding and soldering, since, as the name suggests, it oxidizes the surface of the metal.
The reducing flame is the flame low in oxygen. It has a yellow or yellowish color due to elements (typically carbon or hydrocarbons) which would bind ("reduce") with the oxygen contained in the materials processed with the flame.  The reducing flame is also called the carburizing flame, since this flame tends to introduce carbon into the molten metal.
The neutral flame is the flame in which the amount of oxygen is only enough for burning, and neither oxidation nor reduction occurs.
The reducing or neutral flame is useful in soldering and annealing.
Look at other dictionaries:
Oxy-fuel welding and cutting — Oxyacetylene redirects here. For the song, see Cubanate. Side of metal, cut by oxygen propane cutting torch … Wikipedia
Diffusion flame — In a diffusion flame, combustion takes place at the flame surface only, where the fuel meets oxygen in the right concentration the interior of the flame contains unburnt fuel. This is opposite to combustion in a premixed flame. The fire breather… … Wikipedia
oxidation–reduction reaction — ▪ chemical reaction Introduction also called redox reaction any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes. Many oxidation– reduction… … Universalium
steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying … Universalium
Rocket engine — RS 68 being tested at NASA s Stennis Space Center. The nearly transparent exhaust is due to this engine s exhaust being mostly superheated steam (water vapor from its propellants, hydrogen and oxygen) … Wikipedia
airplane — /air playn /, n. 1. a heavier than air aircraft kept aloft by the upward thrust exerted by the passing air on its fixed wings and driven by propellers, jet propulsion, etc. 2. any similar heavier than air aircraft, as a glider or helicopter. Also … Universalium
Hydrogen — This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see Hydrogen atom. For other meanings, see Hydrogen (disambiguation). ← hydrogen → helium … Wikipedia
Firefighting — Distinguish from a firefight, which means a battle with firearms. Firefighting is the act of extinguishing destructive fires. A firefighter fights these fires to prevent destruction of life, property and the environment. Firefighting is a highly… … Wikipedia
Ultraviolet — UV redirects here. For other uses, see UV (disambiguation). UVB redirects here. For the mysterious shortwave radio station in Russia, see UVB 76. For other uses, see Ultraviolet (disambiguation). False color image of the Sun s corona as seen in… … Wikipedia
Thermite — is a pyrotechnic composition of aluminium powder and a metal oxide which produces an aluminothermic reaction known as a thermite reaction. It is not explosive, but can create short bursts of extremely high temperatures focused on a very small… … Wikipedia