Glossary - O
A group of hydrocarbons with general formula C[n]H[2n] .They are also known as Alkenes and include ethylene, C[2]H[4] and propylene, C[3]H[6]. The position in which welding is performed from the underside of the joint The protrusion of weld metal beyond the weld toe or root weld. The source of oxygen in a chemical reaction e.g. air or oxygen gas. DEFN = "Containing free oxygen atoms which combine with metal to form metal oxides in the reaction called oxidation." Caused by an excess of oxygen in the flame. Oxygen is a colourless, odourless gas. It is represented by the symbol O. It's most important property for use in industrial processes is that it supports combustion. Oxygen forms 21% by volume of the atmosphere. Oxygen has a relative density of 1.105. A group of cutting processes used to sever or remove metals by means of the chemical reaction between oxygen and the base metal at elevated temperatures. In the case of oxidisation-resistant metals, the reaction is facilitated by the use of a chemical flux or metal powder.
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