gas tungsten arc welding!

gas tungsten arc welding

Comprehensive Analysis

1) "Gas" -- As to gas tungsten arc welding 1gas Pronunciation: 'gas Function: noun Inflected Form(s): plural gas�es also gas�ses Etymology: New Latin, alteration of Latin chaos space, chaos 1 : a fluid (as air) that has neither independent shape nor volume but tends to expand indefinitely 2 a : a combustible gas or gaseous mixture for fuel or lighting; especially : NATURAL GAS b : a gaseous product of digestion; also : discomfort from this c : a gas or gaseous mixture used to produce anesthesia d : a substance that can be used to produce a poisonous, asphyxiating, or irritant atmosphere 3 : empty talk : BOMBAST 4 : GASOLINE; also : the accelerator pedal of an automotive vehicle 5 : driving force : ENERGY <I was young, and full of gas -- H. L. Mencken> <ran out of gas in the seventh inning> 6 slang : something that gives pleasure : DELIGHT <the party was a gas> Pronunciation Symbols Gas phase particles (atoms, molecules, or ions.) A gas is one of the four major states of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. Thus, as energy in the form of heat is added, a solid (e.g., ice) will first melt to become a liquid (e.g., water), which will then boil or evaporate to become a gas (e.g., water vapor). In some circumstances, a solid (e.g., "dry ice") can directly turn into a gas: this is called sublimation. If the gas is further heated, its atoms or molecules can become (wholly or partially) ionized, turning the gas into a plasma. 1 Physics 2 Some types of gases 3 Etymology 4 See also 5 External links In a gas phase, the atoms or molecules constituting the matter basically move independently, with no forces keeping them together or pushing them apart. Their only interactions are rare and random collisions. The particles move in random directions, at high speed. The range in speed is dependent on the temperature and defined by the Maxwell-Boltzmann distribution. Therefore, the gas phase is a completely disordered state. Following the second law of thermodynamics, gas particles will immediately diffuse to homogeneously fill any shape or volume of space that is made available to them. The thermodynamic state of a gas is characterized by its volume, its temperature, which is determined by the average velocity or kinetic energy of the molecules, and its pressure, which measures the average force exerted by the molecules colliding against a surface. These variables are related by the fundamental gas laws, which state that the pressure in an ideal gas is proportional to its temperature and number of molecules, but inversely proportional to its volume. Like liquids and plasmas, gases are flowing and free moving fluids: they have the ability to flow and do not tend to ret..." 2) "Tungsten" -- As to gas tungsten arc welding tung�sten Pronunciation: 't&[ng]-st&n Function: noun Etymology: Swedish, from tung heavy + sten stone : a gray-white heavy high-melting ductile hard polyvalent metallic element that resembles chromium and molybdenum in many of its properties and is used especially in carbide materials and electrical components (as lamp filaments) and in hardening alloys (as steel) -- see ELEMENT table Pronunciation Symbols 74 tantalum ← tungsten → rhenium Mo ↑ W ↓ Sg General Name, Symbol, Number tungsten, W, 74 Chemical series transition metals Group, Period, Block 6, 6, d Appearance grayish white, lustrous Atomic mass 183.84(1)  g·mol−1 Electron configuration [Xe] 4f14 5d4 6s2 Electrons per shell 2, 8, 18, 32, 12, 2 Physical properties Phase solid Density (near r.t.) 19.25  g·cm−3 Liquid density at m.p. 17.6  g·cm−3 Melting point 3695 K (3422 °C, 6192 °F) Boiling point 5828 K (5555 °C, 10031 °F) Heat of fusion 52.31  kJ·mol−1 Heat of vaporization 806.7  kJ·mol−1 Heat capacity (25 °C) 24.27  J·mol−1·K−1 Vapor pressure P(Pa) 1 10 100 1 k 10 k 100 k at T(K) 3477 3773 4137 4579 5127 5823 3) "Arc" -- As to gas tungsten arc welding 1arc Pronunciation: 'ärk Function: noun Etymology: Middle English ark, from Anglo-French arc bow, from Latin arcus bow, arch, arc -- more at ARROW 1 : the apparent path described above and below the horizon by a celestial body (as the sun) 2 a : something arched or curved b : a curved path <the arc of a fly ball> 3 : a sustained luminous discharge of electricity across a gap in a circuit or between electrodes; also : ARC LAMP 4 : a continuous portion (as of a circle or ellipse) of a curved line 5 : degree measurement on the circumference of a circle -- used especially in the phrase of arc <11 minutes 3 seconds of arc> 6 : a continuous progression or line of development <a story's dramatic arc> Pronunciation Symbols For abbreviations, see ARC 1 Mathematics 2 Computing 3 Engineering 4 Literature and entertainment 5 Geography 6 Medicine 7 Other 8 See also Arc may refer to: Arc (geometry), a segment of a differentiable curve Arcminute, a measure used for angles, equal to 1/60th of a degree A directed edge in graph theory is sometimes referred to as an "arc" "arc-" is sometimes used as a prefix for an inverse function, specifically trigonometry functions Arc (projective geometry), a particular type of set of points of a projective plane. .arc, a file extension for archive files Arc programming language, a Lisp dialect in development by Paul Graham ARC Macro Language, a high-level algorithmic language for ArcInfo Arc lamp, a device that produces light by an electric arc Electric arc or voltaic arc, an ongoing plasma discharge (an electric current through a gas), producing light and heat In architecture, arc is another term for arch, a bowed or curved structure capable of spanning a space while supporting significant weight (e.g. a doorway in a stone wall), or possibly a free-standing structure, such as a triumphal arch Story arc, an extended or continuing storyline Advance reading copy, an early copy of a book which is sent to reviewers, bookstores, and magazines Arc (album), a live album by Neil Young Arc (band), a Japanese visual kei band Arc, Stockton-on-Tees, an arts centre in Stockton-on-Tees, County Durham, England Attack Retrieve Captur..." 4) "Welding" -- As to gas tungsten arc welding Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material (the weld puddle) that cools to become a strong joint, but sometimes pressure is used in conjunction with heat, or by itself, to produce the weld. This is in contrast with soldering and brazing, which involve melting a lower-melting-point material between the workpieces to form a bond between them, without melting the workpieces. Arc welding Many different energy sources can be used for welding, including a gas flame, an electric arc, a laser, an electron beam, friction, and ultrasound. While often an industrial process, welding can be done in many different environments, including open air, underwater and in space. Regardless of location, however, welding remains dangerous, and precautions must be taken to avoid burns, electric shock, poisonous fumes, and overexposure to ultraviolet light. Until the end of the 19th century, the only welding process was forge welding, which blacksmiths had used for centuries to join metals by heating and pounding them. Arc welding and oxyfuel welding were among the first processes to develop late in the century, and resistance welding followed soon after. Welding technology advanced quickly during the early 20th century as World War I and World War II drove the demand for reliable and inexpensive joining methods. Following the wars, several modern welding techniques were developed, including manual methods like shielded metal arc welding, now one of the most popular welding methods, as well as semi-automatic and automatic processes such as gas metal arc welding, submerged arc welding and flux-cored arc welding. Developments continued with the invention of laser beam welding and electron beam welding in the latter half of the century. Today, the science continues to advance. Robot welding is becoming more commonplace in industrial settings, and researchers continue to develop new welding methods and gain greater understanding of weld quality and propertie..." 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