Rig Fab Educational Services
Welder’s Handbook
Trimix or Triple Mix – A shielding gas consisting of approximately 90% helium, 7-1/2% argon, and 2-1/2% carbon dioxide used primarily for short-circuiting arc welding of stainless steels. Maintains corrosion resistance of the stainless steel and produces good wetting and excellent weld bead shape. Tungsten Electrode – A non-filler metal electrode used in arc welding, arc cutting and plasma spraying, made principally of tungsten. U Ultimate tensile strength – The maximum pulling force to which the material can be subjected without failure. Ultraviolet Light – Short wavelength light emitted during arc cutting and welding processes that is harmful to the eyes and skin. Under-bead Crack / Cracking – A weld defect that starts in the heat affected zone and is caused by excessive molecular hydrogen trapped in that region. It is sometimes referred to as cold cracking, since it occurs after the weld metal has cooled. Undercut – A groove melted into the base metal adjacent to the toe or root of a weld and left unfilled by weld metal.
Weld / Welding – A localized coalescence of metals or nonmetals produced either by heating the materials to the welding temperature, with or without the application of pressure, or by the application of pressure alone and with or without the use of filler material.
Work Clamp – An assembly used to hold the workpiece, generally using hydraulic pressure for clamping force.
Weld Crack – A crack located in the weld metal or heat affected zone.
Welder Certification – Written verification that a welder has produced welds meeting a prescribed standard of welder performance.
Weld Face – The exposed surface of a weld on the side from which welding was done.
Welding Arc – A controlled electrical discharge between the electrode and the workpiece that is formed and sustained by the establishment of a gaseous conductive medium, called an arc plasma. Welding Filler Metal – The metal or alloy to be added in making a weld joint that alloys with the base metal to form weld metal in a fusion welded joint.
Welding Operator – One who operates adaptive control, automatic, mechanized, or robotic welding equipment.
Uphill – Welding with an upward progression.
Welding Power Source – An apparatus for supplying current and voltage suitable for welding.
V Vertical Weld – The welding position in which the weld axis, at the point of welding, is approximately vertical and the weld face lies in an approximately vertical plane.
Welding Procedure – The detailed methods and practices involved in the production of a weldment
Welding Rod – A form of welding filler metal, normally packaged in straight lengths, that does not conduct the welding current.
V-Groove Weld – A type of groove weld.
Volt – Unit of electromotive force, or electrical pressure which causes current to flow in an electrical circuit.
Welding Symbol – A graphical representation of a weld
Vortex – An intense swirling gas similar to a tornado. Most plasma arc cutting systems develop a vortex of some extent in the nozzle during cutting. W Watt – A unit of electrical power. Watts = Volts x Amperes Weathering Steel – Low alloy steel that is specially formulated to form a thin tightly adhering layer of rust. This initial layer prevents further rusting and thus, the need to paint the steel is eliminated. The main alloys in this steel are copper and chromium.
Welding Technique – The details of a welding procedure that are controlled by the welder or welding operator.
Welding Wire – A form of welding filler metal, normally packaged as coils or spools that may or may not conduct electrical current depending upon the welding process with which it is used.
Weldment – An assembly whose component parts are joined by welding.
Weld Metal – The portion of a fusion weld that has been completely melted during welding.
Weld Pass – A single progression of welding along a joint. The result of a pass is a weld bead or layer.
43
Made with FlippingBook Ebook Creator