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	Shielding gas - Wikipedia, the free encyclopedia
		Shielding gases are inert or semi-inert gases that are commonly used in several welding processes, most notably gas metal arc welding and gas tungsten arc welding.
		Other arc welding processes use other methods of protecting the weld from the atmosphere as well – shielded metal arc welding, for example, uses an electrode covered in a flux that produces carbon dioxide when consumed, a semi-inert gas that is an acceptable shielding gas for welding steel.
		The applications of shielding gases are limited primarily by the cost of the gas, the cost of the equipment, and by the location of the welding.
	en.wikipedia.org /wiki/Shielding_gas (357 words)

	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.
		Another common shielding gas, helium, is most often used to increase the weld penetration in a joint, to increase the welding speed, and to weld metals with high heat conductivity, such as copper and aluminum.
		Gas tungsten arc welding is most commonly used to weld stainless steel and nonferrous materials, such as aluminum and magnesium, but it can be applied to nearly all metals, with notable exceptions being lead and zinc.
	en.wikipedia.org /wiki/TIG_welding (4127 words)

	Technical Paper: Gas Tungsten Arc Welding. . . .by Michael Francoeur, President of Joining Technologies - Robotics ...
		Shielding gas can be supplied from individual, portable cylinders, multi-cylinder manifolds or ‘‘tank farms’‘ depending on the required volumes.
		Shielding gas contaminated with moisture or oxygen, resulting from hose leaks or moisture on interior hose surfaces have their destructive effects on weld quality.
		Gas tungsten arc welding is a thermal process depending on conducted heat through the weld joint materials to achieve penetration.
	www.roboticsonline.com /public/articles/archivedetails.cfm?id=1076 (1504 words)

	Welding Processes Welding Tutorial
		Shielding is obtained from the hot ionized gas issuing from the orifice which may be supplemented by an auxiliary source of shielding gas." Shielding gas may be an inert gas or a mixture of gases.
		Shielding is obtained entirely from an externally supplied gas or gas mixture." The electrode wire for GMAW is continuously fed into the arc and deposited as weld metal.
		Shielding is provided by a flux contained within the tubular electrode." Additional shielding may or may not be obtained from an externally supplied gas or gas mixture.
	www.arconweld.com /welding_faq/welding_tutorial.htm (1542 words)

	[No title]
		Shielding gas flows from the gas cylinder, to the gas hose, to the welding gun.
		An arc welding process in which a bare wire electrode and inert or active shielding gas are fed to the weld through a welding gun.
		GMAW shielding gas is supplied by a cylinder and flows through the welding gun.
	www.toolingu.com /class_class_desc.aspx?class_ID=650220 (1900 words)

	Titanium - Welding and Heat Treating
		Gas Tungsten-Arc (GTA) and Gas Metal-Arc (GMA) Welding
		The shielding gas should be continued after a molten puddle forms and the arc is extinguished, until the weld cools.
		The function of the trailing shield is to protect the solidified titanium weld metal and associated heat-affected zones until temperature reaches 800°F (427°C) or lower.
	www.azom.com /Details.asp?ArticleID=1245 (3869 words)

	TIG Welding - My Industry - Applications & Equipment > Welding > Arc Welding & Cutting Processes \| Linde ... (Site not responding. Last check: 2007-10-12)
		A shielding gas that flows through the gas nozzle protects the weld pool and the electrode.
		The key purpose of the shielding gas in TIG welding is to protect the hot and molten parts of the workpiece, the filler metal and the electrode from the deleterious influence of the surrounding air.
		In addition, the shielding gas affects the characteristics of the arc and the appearance of the weld.
	www.us.lindegas.com /international/web/lg/us/likelgus.nsf/DocByAlias/ind_mv_licht2 (270 words)

	Choosing the right shielding gas and supply system for GMAW (Site not responding. Last check: 2007-10-12)
		The most common mistake in selecting the shielding gas is choosing the least expensive one; other factors affect the total cost of the welding process and depend on the quality of the shielding gas used.
		When ferrous metal is welded using carbon dioxide as the shielding gas, spatter accumulates in the gas nozzle, disturbing gas flows, or collects on the end of the contact tube, causing wire feed problems.
		When the shielding gas is changed to a mixture of argon with 25 percent carbon dioxide, the deposition efficiency can increase to 97 percent.
	www.thefabricator.com /Articles/Welding_Exclusive.cfm?ID=240 (1610 words)

	Welding, technical aspects (Site not responding. Last check: 2007-10-12)
		Gas metal arc welding (GMAW) is a semiautomatic process utilizing a continuous, consumable electrode and a "shield" of inert gas (metal inert gas welding, MIG) or active gas (usually carbon dioxide-inert gas mixtures, MAG) to protect the weld from oxygen.
		Shielding gas is provided by a flux contained within the tubular electrode; additional shielding may be provided by an external supply.
		Oxyfuel gas welding is the process by which heat from burning gases is used to melt the base metal without the use of welding rods; however, rods are used when extra metal is needed as a filler to obtain a complete bond.
	cdfc00.rug.ac.be /healthrisk/Welding/technical_aspects.htm (1410 words)

	Hobart Institute of Welding Technology (HIWT) - Summer 2002 World of Welding Newsletter Article
		Gas tungsten arc welding is commonly used for welding titanium.
		At the end of welding, ensure that shielding gas flows directly over the cooling weld behind the torch by equipping the power supply with a foot control, or use a torch-mounted pushbutton contactor control that allows the welder to break the arc without moving the torch away from the work.
		Trailing shields consist of a metal chamber held by a clamp to the torch nozzle.
	www.welding.org /newsletters/summer2002/titanium.html (1135 words)

	Shielding Gases for Gas Metal Arc Welding (GMAW)
		Shielding Gases for Gas Metal Arc Welding (GMAW)
		Gas Metal Arc Welding (GMAW) is used to weld all commercially important metals, including steel, aluminum, copper, and stainless steel.
		Although carbon dioxide is an active gas and produces an oxidizing effect, sound welds can be consistently achieved with pure CO Carbon dioxide is often used in its pure form with welding of carbon steel, because it is readily available and produces good welds at low cost.
	www.praxair.com /praxair.nsf/0/f406fc8ace1333648525656100775f5a?OpenDocument (1841 words)

	REPAIR OF ALUMINUM STRUCTURES (Site not responding. Last check: 2007-10-12)
		The advantage of the helium mixtures are associated with the ability of this gas to provide additional heat during the welding process, and consequently, allowing hydrogen a greater opportunity to escape prior to solidification.
		Shielding gas should meet the minimum purity requirements specified by the appropriate welding code or standard.
		Shielding gas may also become contaminated from imperfections within the gas delivery line such as leaking pipes or hoses.
	www.alcotec.com /qanda4.htm (1102 words)

	MIG Welding (GMAW) - Common Problems and Remedies \| Lincoln Electric
		The GMAW process relies on the shielding gas to physically protect the weld puddle from the air and to act as an arc stabilizer.
		If the shielding gas is disturbed, there is a potential that air could contaminate the weld puddle and lead to porosity.
		If high winds are blowing the shielding gas away from the puddle, it may be necessary to erect wind screens.
	www.lincolnelectric.com /knowledge/articles/content/gmaw.asp (2128 words)

	Untitled Document (Site not responding. Last check: 2007-10-12)
		The shielding gas of choice during the development of the GMAW process was CO2.
		An oxidizing gas component is therefore used to stabilize the arc and to ensure a smooth metal transfer during welding.
		Nitrogen (N) is used as an additive in shielding gases for GTA welding of super-austenitic and super-duplex stainless steels.
	www.arcraftplasma.com /welding/weldingdata/shieldinggases.htm (1297 words)

	Abstract: (Site not responding. Last check: 2007-10-12)
		Apart from hydrogen in the consumables or base materials, potential sources for weldmetal hydrogen are moisture in the shielding gas, the gas supply system and the welding environment.
		In practice, a guaranteed moisture level of max 10 ppm in the shielding gas is of less importance than applied welding parameters.
		Even a moisture level of 1000 ppm in shielding gas in combination with correct welding parameters will result in a sufficient low hydrogen content in the weld, which questions the 10 ppm moisture requirement to the gas supplier.
	www.corrosionsource.com /technicallibrary/ssw/abstracts/welding/D97_070.htm (422 words)

	TIMET: welding titanium: overview, tools, materials, methods.
		During GTA and GMA welding, argon or helium shielding gases of welding grade with dewpoint of -50 degrees F. or lower are used to provide the necessary protection.
		The function of the trailing shield is to protect the solidified titanium weld metal and associated heat-affected zones until temperature reaches 800 degrees F or lower.
		A schematic of a trailing shield, useful for flat sheet or plate welding of titanium, is shown in Figure 12.
	www.timet.com /fab-p27.htm (1355 words)

	Shielding Gases for Welding - Product Lines > Industrial Cylinder Gases \| Linde Gas LLC (Site not responding. Last check: 2007-10-12)
		The gas or gas mixture must be selected according to the required effects on the welding process.
		MISON shielding gases contain a small concentration of nitric oxide which reacts with ozone generated around the weld, reducing it at its source.
		This group of gas mixtures is formulated with the addition of hydrogen or helium to enhance most welding applications.
	www.us.lindegas.com /International/Web/LG/US/likelgus.nsf/DocByAlias/nav_prod_ind_shield (588 words)

	Shielding Gas
		Shielding gas for GTA welding can be argon, helium, or a mixture of argon and helium.
		However, as a shielding gas, helium - allows greater penetration and faster welding speeds because the arc is hotter in the helium atmosphere than in the argon atmosphere.
		The opposite is true for GMA welding; therefore, a mixture of argon and helium is sometimes used in welding metals that require a higher heat input.
	www.tpub.com /steelworker1/83.htm (766 words)

	Simplifying shielding gas selection: How different gases and gas blends affect your welding application (Site not responding. Last check: 2007-10-12)
		Shielding gas flow rates are determined by the process, welding position, and operating parameters.
		Gas flow rates may be reduced if the nozzle-to-work distance is kept as close as possible.
		Shielding gas selection is critical to achieving cost-effective joining of carbon steel, stainless steel, and aluminum.
	www.thefabricator.com /Articles/Welding_Article.cfm?ID=1024 (1900 words)

	REPAIR OF ALUMINUM STRUCTURES (Site not responding. Last check: 2007-10-12)
		Pure argon is the most popular shielding gas and is often used for both gas metal arc and gas tungsten arc welding of aluminum.
		Shielding Gas for Gas Tungsten Arc Welding - When considering the shielding gas for gas tungsten arc welding with alternating current (AC), pure argon is the most popular gas used.
		Gas mixtures, usually 25% helium and 75% argon are sometimes used and can help to increase travel speeds when AC - gas tungsten arc welding.
	www.alcotec.com /qanda9.htm (938 words)

	Shielding gases for MIG/MAG and TIG weldingD3;15= (No Responses);13= (1 Response);14= (% Responses)
		The shielding gas is a vital component in MIG/MAG and TIG welding.
		The gas producers have since the birth of the MIG/MAG process 1948 improved the quality of the shielding gases and this development has also accelerated parallel to the development of power sources and wire electrodes for MIG/MAG and TIG welding.
		The reason why the inert gases are inert and do not react with other elements is that their outer electron shells of the atoms are filled and they have nothing to ”gain” by combining with other elements.
	www.sandvik.com /sandvik/0140/SM/se01240.nsf/f9aff13490287b65ea2564f50042c670/376adbc5a7fb8729412568880049ffee!OpenDocument (636 words)

	Welding Supplies, Helmets & Gases Provided By Havard Welding Supply.
		Straight argon is generally used as a shielding gas in tig welding while mig welding is usually best suited to a mixture of argon and C
		Argon is used primarily for its properties an inert gas in applications such as arc welding, steelmaking, heat treating, and electronics manufacturing.
		In its welding application, straight argon is generally used as a shielding gas in tig welding, while mig welding is usually best suited to a mixture of argon and C
	www.havardwelding.com /welding_gases_argon.htm (257 words)

	Welding with the Right Shielding Gas
		In developing a WPS for gas metal arc or gas tungsten arc welding, many variables must be taken into account such as voltage, amperage, electrode extension, and shielding gas.
		It is the responsibility of your gas supplier to ensure you receive an accurate, consistent shielding gas supply that conforms to AWS A5.32, Specification for Welding Shielding Gases.
		The classification system outlined in the specification clearly identifies the chemical composition of the shielding gas in question, similar to the way welding wires are identified.
	www.aws.org /wj/2001/12/0028 (515 words)

	A solution for weld shielding gas waste
		THE average user of MIG welding consumes between 18 and 30 cubic feet of shielding gas per pound of wire — between three and fives times the amount that could be used.
		Depending on the pipeline pressure, the volume of gas wasted every time a weld is started or even when the welder just inches the wire forward is equal to three to five times the hose volume (when measured at standard temperature and pressure).
		WA Technology found that the excess waste gas at the weld start was expelled, but instead of happening in one second where the surge could be easily heard, it takes several seconds at the reduced flow rate.
	trailer-bodybuilders.com /mag/trucks_solution_weld_shielding (1034 words)

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