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Thorium

Thorium is much more abundant in nature than uranium Thorium can be used as a nuclear fuel through breeding to uranium-233 (U-233) When this thorium fuel cycle is used much less plutonium and other transuranic elements are produced compared with uranium fuel cycles Several thorium-fuelled reactor concepts are under consideration Get price

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TUNGSTEN GUIDEBOOK

Tungsten Guidebook Revision 8 0 (June 2013) Page 8 of 27 2 2 Determinants of Tungsten Performance In most applications welders use tungsten that contains an emission-enhancing oxide such as Thorium Cerium or Lanthanum These oxides naturally migrate from inside theGet price

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WO2005104165A1

The invention relates to a method for the thermal treatment of tungsten electrodes having a fibrous mocrostructure and being free from thorium oxide for high-pressure discharge lamps to such a tungsten electrode free from thorium oxide to a method of manufacturing a high-pressure gas discharge lamp with at least one such tungsten electrode free from thorium oxide to a high-pressure gas Get price

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TUNGSTEN EL 1 6MM 10PCS

Thorium is a so-called a-emitter but when enclosed in a tungsten matrix the a radiation emitted externally is negligible The danger to the welder arises when thorium oxide gets into the respiratory canals This problem can occur during welding (vapours) as well as when grinding the electrode tip (grinding dust) In the near future more Get price

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Guidelines for tungsten electrodes

Mar 07 2006Thoriated tungsten electrodes (AWS classification EWTh-2) contain a minimum of 97 30 percent tungsten and 1 70 to 2 20 percent thorium and are called 2 percent thoriated They are the most commonly used electrodes today and are preferred for their longevity and ease of use Get price

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Thorium Containing Welding Rod (1990s)

Thorium gets into the air because of the volatilization discussed earlier and the grinding that is necessary to put a point on the electrode prior to use As a result of this concern it is expected that the thorium in the rods will eventually be replaced by lanthanum or cerium oxide Airborne Thorium ConcentrationsGet price

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The use of thoriated tungsten electrodes

Dec 24 2019Thorium Oxide Thoriated tungsten electrodes contain 97 3% tungsten and 1 7-2 2% thorium oxide They have low radioactivity and high current carrying ability making them highly suitable for arc welding procedures They are long-lasting and easy to use which is an added advantage Thorium oxide electrodes are ideal for use with a DC power supply Get price

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WO2005104165A1

The invention relates to a method for the thermal treatment of tungsten electrodes having a fibrous mocrostructure and being free from thorium oxide for high-pressure discharge lamps to such a tungsten electrode free from thorium oxide to a method of manufacturing a high-pressure gas discharge lamp with at least one such tungsten electrode free from thorium oxide to a high-pressure gas Get price

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Thorium dioxide

Thorium dioxide (ThO2) also called thorium(IV) oxide (IUPAC) is a white crystalline powder It was formerly known as thoria or thorina It is produced mainly as a by-product of lanthanide and uranium production[1] Thorianite is the name of mineralogical form of thorium dioxide It isGet price

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Thorium_dioxide

Applications Thorium dioxide is used as a stabilizer in tungsten electrodes in TIG welding electron tubes and aircraft engines As an alloy thoriated tungsten metal is not easily deformed because the high fusion material thoria augments the high temperature mechanical properties and thorium helps stimulate the emission of electrons () It is the most popular oxide additive because of its low Get price

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Welding Electrode Chart and Selection

Dec 17 2019The electrode is usable only with flat position welding and for making horizontal fillet welds The electrode can be used with alternating current or direct current with either polarity Iron-oxide-iron power (EXX27) This type of electrode is very similar to the iron oxide-sodium type except it contains 50 percent or more iron power The Get price

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Thoriated tungsten filament

Looking for thoriated tungsten filament? Find out information about thoriated tungsten filament A vacuum-tube filament consisting of tungsten mixed with a small quantity of thorium oxide to give improved electron emission Also known as thoriated emitter Explanation of thoriated tungsten filamentGet price

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THORIUM OXIDE [RADIOACTIVE MATERIAL LOW SPECIFIC

THORIUM OXIDE [RADIOACTIVE MATERIAL LOW SPECIFIC ACTIVITY] Chemical Identifiers cathodes in electron tubes and arc-melting electrodes Hazards What is this information? The Hazard fields include special hazard alerts air and water reactions fire hazards health hazards a Get price

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Welding Rods or Electrodes containing Thorium

rods containing thorium Background The process in which an electrical arc is struck between an inert gas-cooled non-consumable electrode (also known as a welding rod) and the associated metal work pieces is known as tungsten inert-gas (TIG) arc welding The TIG arc welding process is one of the more costly welding processes and isGet price

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Welding Electrode Chart and Selection

Dec 17 2019The electrode is usable only with flat position welding and for making horizontal fillet welds The electrode can be used with alternating current or direct current with either polarity Iron-oxide-iron power (EXX27) This type of electrode is very similar to the iron oxide-sodium type except it contains 50 percent or more iron power The Get price

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Tungsten electrodes

Principal Oxide 1 7–2 2% Thorium Oxide Radioactive Best for use in Direct Current (D/C) applications using transformer based constant current power sources Best for use on non corroding steels titanium alloys nickel alloys copper alloys Good D/C arc starts and stability medium erosion rate medium amperage range medium tendency to spit Get price

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Use of Tungsten Welding Rods Containing Thorium

weight of naturally radioactive thorium oxide (hereafter referred to as thoriated tungsten welding rods) are widely used in industry Using these welding rods can produce measurable levels of airborne radioactive material as a result of volatilizing the tip during welding or grinding rods to put a point on the electrode prior to use Get price

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A pH Electrode Based on Melt

A pH Electrode Based on Melt-Oxidized Iridium Oxide Sheng Yao * Min Wang * and Marc Madouz NSF Center for Industrial Sensors and Measurements The Ohio State University Columbus Ohio 43210 USA Fabrication and characterization of a novel potentiometric pH electrode based on melt-oxidized iridium oxide film is presented Get price

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Thorium in SFA

Oct 23 2002Is anyone aware of health problems resulting from the use of 2% Thorium electrodes for GTAW? (red stripe) The information on the EPA web site does not paint a pretty picture for Thorium Oxide Also what is typical industry practice for the disposal of grinding dust generated from sharpening?Get price

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US2798808A

United States Patent METHOD OF INTRODUCING ZIRCONIA INTO TUNGSTEN POWDER PRELIMINARY TO FORMING ELECTRODES Charles'V Iredeli Essex Fells and Harry C Milbank Bloomfield N J assignors to Westinghouse Electric Corporation East Pittsburgh Pa a corporation of Pennsylvania No Drawing Get price

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TIG Welding 10

Thoriated tungsten contains thorium oxide and is the most commonly used tungsten Thoriated tungsten electrodes are superior to pure tungsten electrodes in many respects The thorium provides longer life and greater resistance to contamination of the weld Arc starting is Get price

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Thorium_dioxide

Applications Thorium dioxide is used as a stabilizer in tungsten electrodes in TIG welding electron tubes and aircraft engines As an alloy thoriated tungsten metal is not easily deformed because the high fusion material thoria augments the high temperature mechanical properties and thorium helps stimulate the emission of electrons () It is the most popular oxide additive because of its low Get price

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welding

Thoriated tungsten TIG electrodes were in use 45 years ago What were their specific use and problems? Thorium oxide (thoria) has been there is a risk to the person grinding the electrodes in breathing in the thorium and alpha particles in the dust This then increases the posibility of the person doing the grinding of developing cancer Get price

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Hot cathode

In vacuum tubes and gas-filled tubes a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic emission This is in contrast to a cold cathode which does not have a heating element The heating element is usually an electrical filament heated by a separate electric current passing through it Hot cathodes typically achieve much Get price

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Thorium

Thorium-Tungsten Electrode is widely used as an additive Oxide electrode having much more advanced comprehensive welding performance than the properties of pure tungsten electrode and other oxide electrodes It can not be replaced by other oxide electrodes during the long using process It can be operated easily Get price

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10pcs Red Color Code 175MM Thorium Tungsten Electrode Head

Thoriated tungsten electrode contains 1 7%-2 2 % thorium oxide and its electron work function is 2 7ev So it can be widely used in various TIG and PAW for its easy and sta ble arcing Thorim ox ide has strong current -carrying capacity high recry stallization temperature better conductivity strong mechanocal cutting performance and longer Get price

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Thorium Dioxide

Thorium is radioactive giving off both alpha and gamma radiation Employers should consider the use of an alternative thorium free electrode to reduce the risk from radioactivity Bulk supplies of thoriated tungsten electrodes should be stored in a metal cabinet or box labelled to indicate the contents Get price

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Selection and Preparation Guide for Tungsten Electrodes

This evenness allows the electrode to maintain a sharpened edge—the ideal electrode shape for welding thin steel Sharpening the electrode's point however should be done with great care Thorium is radioactive therefore you must always follow manufacture's warnings instructions and the MSDS (Material Safety Data Sheet) for its use Get price

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TIG welding electrodes

Notwithstanding the dangers that slightly radioactive electrodes may pose many welders in Europe and Asia continue to swear by "their red" WTh20 Up to 4 percent by weight of thorium dioxide is added to alloys of the WTh type during production Ignitability increases with a higher oxide Get price

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Why tungsten electrodes are mixed with thorium and

Oct 25 2015here is your answer i have added pure tungsten because these 3 electrodes are the most commonly used for tig welding i use thoriated for carbon and stainless steels i find that the pure tungsten spits off the balled end at a lower temp thanGet price

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