A filler metal is a metal added in the making of a joint through welding, brazing, or soldering. Four types of filler metals exist—covered electrodes, bare electrode wire or rod, tubular electrode wire and welding fluxes. Sometimes nonconsumable electrodes are included as well, but since these metals are not consumed by the welding process, they are normally excluded. Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ... Brazing is a joining process whereby a non-ferrous filler metal and an alloy are heated to melting temperature (above 450°C / 800°F) and distributed between two or more close-fitting parts by capillary action. ... (De)soldering a contact from a wire. ...

Covered electrodes are used extensively in shielded metal arc welding and are a major factor in that method's popularity. Shielded metal arc welding a pipe Shielded metal arc welding (SMAW), also known as manual metal arc (MMA) welding or informally as stick welding, is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. ...

Bare electrode wires are used in gas metal arc welding and bare electrode rods are used in gas tungsten arc welding. Gas metal arc welding (GMAW), sometimes referred to by its subtypes, metal inert gas (MIG) welding or metal active gas (MAG) welding, is a semi-automatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun. ... Gas tungsten arc welding Gas tungsten arc welding (GTAW), commonly known as tungsten inert gas (TIG) welding or wolfram inert gas (WIG) welding, is an arc welding process that uses a nonconsumable tungsten electrode to produce the weld. ...

Tubular electrode wire is used in flux-cored arc welding. A wire feeder configured for . ...

Welding fluxes are used in submerged arc welding. A submerged arc welder used for training. ...

References

• Cary, Howard B. and Scott C. Helzer (2005). Modern Welding Technology. Upper Saddle River, New Jersey: Pearson Education. ISBN 0-13-599290-7.