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Topic: Tungsten inert gas welding

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	Gas tungsten arc welding - Wikipedia, the free encyclopedia
		Gas tungsten arc welding (GTAW), commonly known as tungsten inert gas (TIG) welding, is an arc welding process that uses a nonconsumable tungsten electrode to produce the weld.
		The weld area is protected from atmospheric contamination by a shielding gas (usually an inert gas such as argon) and a filler metal is normally used as well, but some welds, known as autogenous welds, do not require it.
		This process was perfected in 1941, and became known as heliarc or tungsten inert gas welding, because it utilized a tungsten electrode and helium as a shielding gas.
	en.wikipedia.org /wiki/Tungsten_inert_gas_welding (2046 words)

	Inert Gas Welding
		An inert gas surrounds the arc and shields it from the ambient to prevent oxidation.
		Tungsten Inert Gas (TIG) Welding: An arc is truck between a tungsten electrode (non-consumable) and the sheet metal to be welded.
		An inert gas shields the arc from the ambient to prevent oxidation.
	www.efunda.com /processes/metal_processing/welding_inertgas.cfm (732 words)

	Gas tungsten arc welding -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-29)
		The molten weld and the arc zone are protected from atmospheric contamination by a shielding gas (usually, but not always, an inert gas such as (A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere) argon).
		Welding (A silvery ductile metallic element found primarily in bauxite) aluminium is done with (An electric current that reverses direction sinusoidally) AC current rather than (An electric current that flows in one direction steadily) DC and pure tungsten or zirconiated tungsten tips are preferred.
		When using AC (for aluminium), electrons jump from the tungsten electrode to the aluminium during the electrode-negative part of the AC cycle, and from the aluminium to the electrode during the electrode-positive part of the cycle.
	www.absoluteastronomy.com /encyclopedia/g/ga/gas_tungsten_arc_welding.htm (854 words)

	Encyclopedia: Argon (Site not responding. Last check: 2007-10-29)
		Argon is used as an inert gas shield in many forms of welding, including mig and tig (where the "I" stands for inert).
		Gas Metal Arc Welding (GMAW), commonly called Metal inert gas welding (MIG welding), is a type of welding which utilises a welding gun through which a continuous wire electrode and an inert shielding gas is fed....
		In this process a non-consumable tungsten electrode is used and the electric arc occurs between this electrode...
	www.nationmaster.com /encyclopedia/Argon (3859 words)

	Welding - Open Encyclopedia (Site not responding. Last check: 2007-10-29)
		Welding is the joining together of materials (typically metals or thermoplastics), usually by a fusion process.
		Most commonly, workpieces are welded by melting both of them and adding more molten metal or plastic to form a pool that cools to form a strong joint.
		Welding differs from soldering and brazing in that enough heat is applied to melt the materials to be joined.
	open-encyclopedia.com /Welding (124 words)

	Oxy-acetylene welding process
		The welding tip is mounted on the end of the torch handle and fuel and gas mixture pass through it to feed the flame.
		Welding tips have only one hole while cutting tips have a centrally located hole with a number of smaller holes located around it in a circular pattern.
		In oxy-acetylene welding, the flame produced by the combination of the gases melts the metal faces of the workpieces to be joined, causing them to flow together.
	www.advantagefabricatedmetals.com /oxyacetylene-welding.html (496 words)

	Gas Tungsten Arc Welding
		Gas tungsten arc welding (TIG welding, heliarc welding, or GTAW) is a process in which the joining of metals is produced by heating therewith an arc between a tungsten (nonconsumable) electrode and the work.
		The heated weld zone, molten metal, and tungsten electrode are shielded from the atmosphere by a covering of inert gas fed through the electrode holder.
		Welding may also be stopped by withdrawing the electrode from the current quickly, but this can disturb the gas shielding and expose the tungsten and weld pool to oxidation.
	www.weldprocedures.com /tig.html (1732 words)

	Job knowledge for welders 6: Tungsten inert gas (TIG or GTA) welding
		Using an inert gas shield instead of a slag to protect the weldpool, the process was a highly attractive replacement for gas and manual metal arc welding.
		In the TIG process the arc is formed between a pointed tungsten electrode and the workpiece in an inert atmosphere of argon or helium.
		Because the electrode is not consumed during welding, the welder does not have to balance the heat input from the arc as the metal is deposited from the melting electrode.
	www.twi.co.uk /j32k/getfile/jk6.html (1094 words)

	TIG Welding (Site not responding. Last check: 2007-10-29)
		A sheath of inert gas surrounds the electrode, the arc, and the area to be welded.
		Crater Fill Switch- The crater fill circuitry provides a gradual taper of the weld current as the arc is extinguished from the level on the Current Control Dial to a lower level.
		In welding a lap joint or T joint with or without filler rod, the procedure is similar to that for a butt joint except that the puddle should be started on the bottom piece.
	prl.stanford.edu /documents/html/TIGweld.htm (4376 words)

	Joining Aluminium Based MMCs
		Welding of a 45 mm diameter bar of 2618/SiC MMC was undertaken using rotary friction welding.
		There was little dependence of the weld appearance on process parameters, and a typical macrosection from one of the welds is shown in Figure 2.
		In the as-welded condition, a minimum hardness value of about 120 HV appeared about 5 mm either side of the weld, although the parent material hardness (160 HV) was almost recovered at the bond line.
	www.azom.com /details.asp?ArticleID=514 (2096 words)

	TIG Welding vs MIG Welding
		The TIG (Tungsten Inert Gas) welding process (also known as gas tungsten arc welding, GTAW, or HELIARC, a trade name of Linde) generates heat from an electric arc maintained between a non consumable tungsten electrode and the part being welded.
		The puddle, the tungsten electrode and the filler rod are protected from atmosphere by a shield of inert gas to prevent rapid oxidation of the weld and surrounding metal.
		Because the gas shield does not produce the slag that normally is created by flux, the danger of slag inclusion in the weld metal is eliminated.
	www.ridgenet.net /~biesiade/weld.htm (1067 words)

	Services - Tungsten Inert Gas Welding (Site not responding. Last check: 2007-10-29)
		Gas Tungsten Arc Welding (GTAW) is frequently referred to as TIG welding.
		In TIG welding an arc is formed between a non-consumable tungsten electrode and the component being welded.
		Gas is fed through the torch to shield the electrode and molten weld pool.
	www.creativevacuum.co.uk /Tungsten_Inert_Gas_Welding.html (240 words)

	Tungsten Inert Gas ( TIG ) Welding of Aluminium Alloys — The Principles and The Process (Site not responding. Last check: 2007-10-29)
		In the tungsten inert gas (TIG) welding process, an electric arc is struck between a refractory electrode made of tungsten and the work piece, while a shroud of inert gas, usually argon, shields the electrode and protects the molten pool against oxidation.
		TIG welding is suitable for metal thickness between 1 and 6 mm.
		Depending on the weld preparation and the work piece thickness, it is possible to work with or without a filler.
	www.azom.com /details.asp?ArticleID=2111 (346 words)

	Hoosier Hills Career Center - Welding (Site not responding. Last check: 2007-10-29)
		Welding skills are needed for a variety of manufacturing careers that involve fabrication and repair of equipment.
		The Hoosier Hills Career Center welding course covers numerous basic welding skills and is designed to introduce and begin preparation for American Welding Society (AWS) certification.
		Welding is also a medium for sculpture and artistic expression.
	www.hhills.mccsc.edu /welding.htm (332 words)

	Materials Engineering (UK) Gas Shielded Tungsten Arc Welding (Site not responding. Last check: 2007-10-29)
		The basic equipment for TIG welding is the same as that used for MMA, but with the additions of a torch/electrode holder which can provide a gas supply to the weld area, and additional components with specific functions are also included.
		As a general guide for DC welding a sharp point with a 1-3 x diameter taper should be used, the lower the current the longer the taper and vice-versa.
		The delivery of inert gases such as Argon, and Nitrogen into confined spaces may lead to the oxygen content of the air being reduced to a point where there is a danger of asphyxiation.
	www.meg.co.uk /meg/app06.htm (1383 words)

	Gas Tungston Arc Welding, GTAW, TIG - Engineers Edge (Site not responding. Last check: 2007-10-29)
		It is more commonly known as Tungsten Inert Gas (TIG) welding and by the trade names of Heliarc or Heliweld.
		These trade names were derived from the fact that the inert gas originally used was helium.
		A stream of inert gas such as argon or helium flows out of the torch and envelopes the arc, thereby preventing the formation of oxides in the puddle.
	www.engineersedge.com /weld/gtaw.htm (213 words)

	The Trades: Welding
		This course explains how oxyacetylene gas welding equipment is used to weld ferrous metals.
		Topics to be covered include welding in the flat position, welding of butt, T-fillet, and lap joints.
		This class is for persons who have had some or no formal training in the use of gas welding equipment.
	honolulu.hawaii.edu /cet/courses/courses_welding.htm (559 words)

	Tungsten Inert Gas Welding (Site not responding. Last check: 2007-10-29)
		This course is for delegates who are required to carry out TIG/TAG welding operations, either to company specification, or to an appropriate coding.
		Deposit weld metal in a range of positions, on a variety of metal specifications.
		Produce welded joints according to the standard required by the company or individual.
	www.evita.co.uk /fweld03.htm (145 words)

	Tig Welding Basics#1
		On TIG weld joints requiring filler or reinforcement, filler metal is added from outside of the arc either by hand or small, automatic filler rod feeders.
		This makes the TIG welding process ideal for use where it is critical not to heat very large areas.
		Inert gases do not combine with atmospheric gases which make them ideal for shielding the weld puddle and heat zone.
	www.alpharubicon.com /elect/tigbasic1.htm (838 words)

	Anionics Inc. Electron Beam Welding, Dunnage Washing, Vacuum Impregnation, TIG MIG Welding
		The process utilizes a non-consumable electrode usually Tungsten, which is used to create an arc at the weld joint.
		An arc is formed between the electrode and the components to be welded.
		In manual welding, the relatively small arc is ideal for thin sheet material or controlled penetration.
	www.anionics.com /tig_weld.html (308 words)

	Welding (Site not responding. Last check: 2007-10-29)
		This course is for art majors, artists, or anyone who would like to learn about welding in order to make their metal sculpture.
		YouÍve spent days, months, or years with designing your metal project and now it is time to construct it, but you have no idea where to start or what to do.
		Students will be given an overview of the test procedures and be given practice plates (either 3/8" or 1" plates depending on the test they will be taking) to weld in the vertical and overhead position using the 7018 electrode.
	www.hcc.hawaii.edu /noncredit/courses/welding.html (747 words)

	Articles - Bicycle frame (Site not responding. Last check: 2007-10-29)
		Recent advances in metallurgy have created ("air hardening") tubing that is not adversely affected, or whose properties are even improved by high temperature welding temperatures, which has allowed both TIG and MIG welding to sideline lugged construction in all but a few high end bicycles.
		A more economical method of bicycle frame construction uses cylindrical steel tubing connected by TIG welding or brazed (fillet) welding, which does not require lugs to hold the tubes together.
		Titanium frame tubes are almost always joined by Tungsten inert gas welding (TIG), although vacuum brazing has been used on early frames.
	www.mountainbikescenter.com /articles/Bicycle_frame (2615 words)

	Welding Rod Lawyers: Different Welding Processes
		Provided below is a list of the many different forms of electric welding, although this list is not all encompassing, these forms have been noted to cause a greater amount and concentration of fumes as opposed to torch or oxygen welding.
		Each link below provides a brief description of the form of welding as well as an injury form that is provided with the title of that specific process of welding, enabling Welding-Rods-Lawsuits.com to better serve and categorize areas of injury.
		Welding rod fumes contain manganese a deadly neurotoxin that inhibits the brain’s ability to regulate physical motion.
	www.welding-rods-lawsuits.com /lawyer/welding_rod_processes.html (593 words)

	WELDING TECHNOLOGY (Site not responding. Last check: 2007-10-29)
		WT 1300 BASIC TUNGSTEN INERT GAS WELDING (3) Prerequisite: 1050 or permission of adviser Inert-gas shielded arc welding (TIG) with manually operated torch, set-up and adjustment, and manipulative skill, ferrous and non-ferrous metals.
		WT 2250 ADVANCED ARC WELDING (3) Prerequisite: 1250 or permission of adviser Cutting and preparing steel plate for single veegroove welds, and making butt, fillet, and groove welds, using stringer and weave bead, structural certification test procedures and typical structural test plates are cut, beveled, and welded.
		WT 2350 ADVANCED TUNGSTEN INERT GAS WELDING (3) Prerequisite: 1300 or permission of adviser A continuation of the TIG process, joining of heavy gauge nonferrous metals, ferrous and nonferrous pipe welding; flat, vertical, horizontal, and overhead welding methods for TIG and SMA pipe welding.
	www.apsu.edu /~records/bulletin/9597/cwt.htm (398 words)

	Old Colony Regional Vocational Technical High School - Rochester, MA
		All types of welding are in the Welding/Metal Fabrication department, such as Gas Tungsten Arc Welding (GTAW), Gas Metal Arc Welding (GMAW), Oxy-Acetylene Welding, Brazing, and soft soldering.
		The American Welding Society is the largest organization in the world dedicated to advancing the science, technology and application of welding.
		The welding department membership includes free welding journals, welding handbook, updates on the Jefferson's Welding Encyclopedia, and opportunities to visit the latest equipment at the society's International Welding and Fabricating Exposition.
	www.oldcolony.tec.ma.us /vocshops/weld.htm (612 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		The use of the tungsten inert-arc Process for joining aluminum tubing was investigated.
		The welds were requlred to be leak tight, smooth and metallurgically sound in relation to the base metal.
		It was coucluded that welds could be made to meet all the requirements except that drop-through on the inside surface exceeded the allowed 0.003 in.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=4287053 (141 words)

	Welding
		Welding Fundamentals (36 clock hours) - Study of the theory and application of basic Shielded Metal Arc Welding (SMAW) will include the setting of equipment, selecting electrodes, and running of beads and flat positions.
		TIG Welding (48 clock hours) - Course will study tungsten inert gas welding, and will consist of the study of equipment, safe practices, different uses and advantages of TIG welding, and the general practice of inert gas welding.
		Welding experience is necessary for successful completion of Fundamentals of Welding or MIG Welding.
	www.asutc.org /welding2003.htm (446 words)

	Advanced Welding (Site not responding. Last check: 2007-10-29)
		Covered in this course are the more advanced and job oriented welding processes used in the welding and agriculture fabrication industry of today.
		These processes are: Metal Inert Gas (M.I.G. or wire welding); Tungsten Inert Gas (T.I.G. or hiearc welding); advanced techniques in A/C stick welding; D/C stick welding; oxygen-acetylene welding; cutting, brazing and bronze welding.
		Some cast iron welding, hard facing, stainless welding, and aluminum welding will also be experienced.
	www.puhsd.k12.ca.us /deloro/deptfold/coursedesc/adv_weld.htm (415 words)

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