مصنع لتجهيز البوكسيت/Thorium O Ide Electrode
thorium oxide electrode tungsten Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Lifetime Appliion number US39408A Inventor Gemsa Johannes
Thoriated tungsten electrodes were introduced approximately fifty years ago as an alternative to the use of pure tungsten electrodes. The word "thoriated" means that each of the electrodes contains a small amount (1or 2% by weight) of thorium dioxide (ThO2).
Thorium oxide (or thoria) alloy electrodes were designed for DC appliions and can withstand somewhat higher temperatures while providing many of the benefits of other alloys. However, it is somewhat radioactive. Inhalation of the thorium grinding dust during preparation of the electrode is hazardous to one's health.
Jun 29, 2011 · When this oxide is heated in air, thorium metal turnings ignite and burn brilliantly with a white light. Because of these properties, thorium has found appliions in welding electrodes, heatresistant ceramics, light bulb elements, lantern mantles and arclight lamps.
General Description. White powder. Density g / cm3. Not soluble in water. Used in hightemperature ceramics, gas mantles, nuclear fuel, flame spraying, crucibles, nonsilicia optical glass, alysis, filaments in incandescent lamps, hodes in electron tubes and arcmelting electrodes.
Thorium oxide (ThO 2), also called thoria, has one of the highest melting points of all oxides (3300°C) and so it has found appliions in light bulb elements, lantern mantles, arclight lamps, welding electrodes and heatresistant ceramics. Glass containing thorium oxide has both a high refractive index and wavelength dispersion, and is used ...
Zirconium oxide (ZrO2) also helps tungsten emit electrons freely. The addition of zirconium to the tungsten has the same effect on the electrode characteristic as thorium, but to a lesser degree. Because zirconium tungstens are more easily melted than thorium tungsten, ZrO2 electrodes can be used with both AC and DC currents.
Sep 18, 2019 · Thoriated tungsten electrodes contain % pure tungsten and approximately 2% thorium oxide, which has low radioactivity. These electrodes are used for DC welding of steels and other metals. Thoriated electrodes have an increased currentcarrying ability and is the main reason it suits arc welding. The electrodes are easy to use and last a ...
Oct 23, 2002 · Thorium in Tungston electrodes. By rhoople Date 15:08. Yes, this was brought to my attention one day by one of the welders on the floor. I did some research, and did not get a real definitive answear on it. I read an artical in the welding journal and it discussed it briefly.
Aug 23, 2021 · Thorium oxide is, consequently, a lowlevel radioactive material that might bring about both a little outside radiation danger and an interior risk from ingestion or inward breath. The outside danger assessed for a welder holding an anode for an entire year is a tiny part of the most extreme allowable radiation portion.
Answer (1 of 4): Reaction at the hode (the electrode connecting to the negative electrode of the cell): Al³⁺(ℓ) + 3e⁻ → Al(ℓ) Reaction at the anode (the electrode connecting to the positive electrode of the cell): 2O²⁻(ℓ) → O₂(g) + 4e⁻
Jul 14, 2021 · Radionuclide Basics: Thorium. Thorium (chemical symbol Th) is a naturally occurring radioactive metal found at trace levels in soil, rocks, water, plants and animals. Thorium is solid under normal conditions. There are natural and manmade forms of thorium, all of which are radioactive. In general, naturally occurring thorium exists as Th232 ...
Makes Tungsten welding electrodes burn hotter. Forms strong but less brittle alloys. Thoria Thorium oxide (ThO 2) is added to help gas mantles burn hotter and brighter. Added to make high refractive glass, camera and binocular lenses. See NCRP Report No. 95 "Radiation Exposure of the Population from Consumer Products and Miscellaneous ...
WT20 2% Thoriated Tungsten Electrodes (AWS classifiion EWTh2) contain a minimum of per cent tungsten and to per cent thorium and are called 2 per cent thoriated. They are the most commonly used electrodes today and are preferred for their longevity and ease of use. Thorium, however, is a lowlevel radioactive hazard and many ...
Sep 10, 2020 · Thoriated tungsten is a red colorcoded electrode with a principal oxide of % thorium oxide. This has long been one of the universal goto options for any metal and strength for DC compatibility. Thoriated tungsten has a stable arc and easy start up.
May 17, 2018 · Longer service life than tungsten/thorium or tungsten/cerium oxide electrodes Poorer ignition properties; High Frequency Ignition. One particular characteristic of TIG is that the arc can be ignited without contact. A series of fast highvoltage pulses cause a spark to jump across to the workpiece and the arc then stabilizes itself. High ...
Feb 27, 2003 · For this type of welding, 2 percent thoriated tungsten electrodes, ground to a conical point, are recommended almost universally. To make this type of electrode, we disperse small particles of thorium oxide, or thoria, in the tungsten so it makes up 2 percent by volume of the electrode. Thoria is used for two reasons.
Although thorium is a radioactive element, it has been widely used for many years because of its low escape work, high and stable electron emission. Thorium tungsten alloy wire is mainly used in the manufacture of electronic tube, tube hook, spring, high temperature electrode, and a gas discharge light source hode and seismic.