Glossary - F
An iron-carbon solid solution, stable up to 910oC, and at 723oC contains a maximum of 0.02wt% carbon. Its structure is body-centred cubic (bcc). The material added to a welded, brazed and soldered joint. The mechanical and chemical properties of the filler affect the strength and corrosion resistance of the joint. Filler can be supplied as wire, rod, rings or shapes. A joint formed when one plate is joined to another at right angles to form a 'T'. This type of joint is most widely used in arc welding. The Flame Intensity is the amount of energy released per unit time per unit area of primary flame front. It is used to evaluate the effectiveness of the fuel. A measure of how fast the flame will travel through an unburned gas mixture. Flame speed has a major impact on the burner design and controls, as well as the heat transfer rate. The temperature at the hottest part of the flame. Gas that forms a flammable mixture with air at a concentration of 13% or less, determined at normal atmospheric pressure. The range over which a gas will form a flammable mixture with air. Flashback is the action of the flame and it's pressure wave travelling back through the torch and into the gas delivery system. An essential safety device which prevents flashbacks travelling into the regulator or cylinder. Flashback arrestors are specific to each gas and must not be interchanged. A weld produced in the flat or 1G position A substance applied to the surface of metals to be soldered to inhibit oxidation and aid the flow of filler. Also used to describe substances used in the smelting of metals to assist in the removal of impurities as slag. An arc welding process that uses an arc between a continuous filler metal electrode and the weld pool. The process is used with shielding gas from a flux contained within the tubular electrode, with or without the additional shielding from an externally supplied gas, and without the application of pressure. A composite tubular filler metal electrode consisting of a metal sheath and a core of various powdered materials, producing an extensive slag cover on the face of a weld bead. External shielding may be required. The process whereby a liquid becomes a solid under a change in temperature or pressure. A welding process that uses a rotating tool moving along a joint to produce a sufficiently high temperature to forge two components. The airborne particles of consumable or parent plate produced by the welding or cutting processes. A measurement of how much particulate welding fume is produced, by a process or a consumable, in a unit of time, expressed as g/min or g/hr. The melting together of filler metal and base metal (substrate), or of base metal only, which results in coalescence.
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