Welding Trade Terms with 100% correct definitions.

Potentiomoter A three-terminal resistor with an adjustable center conection used for variable voltage control Truncated A Conical shape having its vertex (point) cut off Tungsten A nonstandard common name for the tungsten electrode used in GTAW; also, the principle metal from which electrodes are constructed Bonded The permanent joining of metalic parts to form an electrically conductive path that will assure electrical continuity and the capacity to sefely cunduct any current likely to imposed on it Electrically Grounded Connected to earth or some conducting body that serves in place of the earth Fume plume The fumes, gases, and particles from combustibles, base metals, and base metal coating during the welding process IDLH Immediate danger to life and health Purgin gas A gas such as nitrogen or argon that is classified as inert because it will not react with other material Ventricular fibrullation Irregular heart rhythm characterized by a rapid flutteriiing heart beat Backfire A loud snap or pop as a tourch flame is extenguished Carburizing flame A flame burining with an excess amount of fuel; also called a reducing flame Draf lines the lines on the edge of a material that result from the travel of the cutting oxygen stream into, through, and out of the metal Dross The material that is expeled from the kerf when cutting using a thermal process, sometimes called slag Ferrous metals Metals containing iron Flash back The flame burning back into the tourch hose or regulator causing a high pitched whistling or hissing sound Kerf The gap produced by a cutting process Neatral flame A flame burning with correct proportions of fuel gas and oxygen Oxidizing flame A flame burning with an excess amount of oxygen Peirce To penetrate through metal plate with an oxyfuel cutting tourch Soapstone Soft, white stone used to mark metal Duty cycle The length of time a machine can cut without overheating within a 10 minute cycle Plasma A fourth state of mater created by heating a gas to such a high temperature that it boils electrons off the gas molecules Potential The relative electrical voltage between two points of reference Solenoid valve A valve that is open or closed by the action of an electromagnet Carbon-graphic electrode An electrode composed of a mixture of soft amophous carbon and hard graphite carbon that may be coated with copper Oxidize To combine with oxygen, such as in burning (rapid oxidation) or rusting (slow oxidation). Washing The process of thermally cutting objects or projections from the surface of the base metal Backing A weldable or nonweldable meterial used behind a root opening to allow defect-free welding at the open root of a joint Base metal Metal to be welded, cut, or brazed Code A set of regulations covering permissible materials, service limitations, fabrication, inspection, testing proceedures, and qualifications of welders Distortion The expansion and contraction of welded parts caused by the heating and subsequent cooling of the weld joint Load The amount of force applied to a material or structure Melt-through Complete joint penetration Nonferousmetal A metal such as aluminum, copper, or brass, lacking suficient quantities or iron to have any effect on its properties Oxide The scale that forms on metal surfaces when they are exposed to air Peen The rounded end of a ball hammer used to strike a weld as it cools to reduce stress on a weld Piping porosity A form of porosity having a length greter than its width and that is approximatley perpendicular to the weld face Porosity Gas pockets, inclusions, or voids in the weld metal Root face A small facing on the end of a bevel for a goove weld Root opening The space between the base metal pieces at the bottom or the root of the joint Surfacing The application by welding, brazing, or thermal spraying of a layer of material to a surface to obtain desired properties or dimensions Transverse Placed or running crosswise Weathering steel Steel alloy that under specific conditions is designed to form a very dense oxide layer on its outer surface, which retards further corosion WPS Welding Procedure specifications- The documetn containing all the dtailed methods and practices required to produce a sound weld Weldment An assembly that is fastened together by weld joints Alternating current Electrical current that reverses its flow at set intervals Amperage Ameasurement of the rate of flow of electric current Arc The flow of electricity through an air gap or gaseous space Direct current Electrical current that floes in one direction only Electrode Terminal point to which electricity is brought into the welding operation and form which the arc is produced to do the welding Polarity The direction of flow of electrical current in a direct current welding circuit Primary current Electrical current recieved from conventional power lines used to energize welding machines Step-Down trasformer An electrical device that uses 2 wire coils of different sizes to convert a high-voltage, low-current power source into a lower voltage,