1970s Shanghai Bulb developed into cerium tungsten electrodes , then realized industrialization . Rare earth cerium than thorium (Th) has a higher electron emission features, but is a non- radioactive elements. Arc made ​​application performance comparison results : 2% ahead of Japan 2% cerium tungsten thorium tungsten, 4% better than 2% cerium tungsten, cerium tungsten ( No 4% thoriated tungsten electrode ) , specific performance: arc high compression , slender arc stability, energy concentration, arcing power or low voltage, arc breaking spacing, life doubled. 4% cerium tungsten electrodes applications , capturing the processing of cotton textiles shrink " shrink machine key components damping damping stick " plasma thermal spraying the surface finish of the storm , breaking the monopoly of foreign companies , foreign exchange value of the needle cotton greatly increased. Ministry of Geology research with platinum foil tube sealing technology, the requirements do not make the barrel of liquid volatile chemicals reduction of the problem, but also with 4% cerium tungsten electrodes only solution .

MEW already provides that where more than ten thousand kilowatts generator must Shanghai Bulb cerium tungsten electrodes welding , quality assurance. Defense with a laser device is life after cerium tungsten electrodes with thorium tungsten electrode from the original ten minutes , up to hundreds of hours of energy and light load efficiency is also improved, the battle to solve practical problems . 1982 China's offshore missile tests, foreign -made laser performance over competing devices , including cerium tungsten electrodes show a huge role . In addition, in beacon lights, road lights aircraft , fundus fluorescein camera lights , lamps and other lighting layout more than 140 kinds of gas discharge light source applied and achieved good results . Currently, 2% cerium tungsten electrodes have been included in the international standard , China has also developed a national standard cerium tungsten electrodes , so that the formation of the first in the world can replace thoriated tungsten series of international standards to add 1%, 2 %, 3% , 4% of the non-radioactive standard cerium tungsten electrodes .


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
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In one aspect, a bucking bar device for use in riveting parts together is described. In one embodiment, the bucking bar device includes a bucking bar, and a sleeve positioned so that the bucking bar extends within the sleeve. One end of thesleeve is configured to be positioned adjacent to at least one of the parts.

In another aspect, a sleeve for use with a bucking bar device including a bucking bar is described. The sleeve includes a cylinder engaging sleeve member having threads on an internal surface, and an intermediate sleeve member having threads onan outer surface. The intermediate sleeve member is in threaded engagement with the cylinder engaging sleeve member. A non-marring sleeve member is at least partially inserted into the intermediate sleeve member and extends therefrom.

In yet another aspect, a method for installing a rivet is provided. The method includes the steps of setting a recess between an impact face of a bucking bar device and a reference surface of a bucking bar sleeve assembly operatively attachedto the bucking bar device to form a bucking bar and sleeve assembly, placing an end surface of the bucking bar sleeve assembly around a buck tail of the rivet to be set and against the surface of the material to be riveted, and compressing the buck tailof the rivet using the bucking bar and sleeve assembly until the impact face of the bucking bar no longer impacts the buck tail of the rivet.

Tungsten Bucking Bar Manufacturer & Supplier: Chinatungsten Online - http://www.buckingbar.cn
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Cerium tungsten electrodes in tungsten adding rare earth cerium oxide powder metallurgy and rolling through grinding and polishing process made of tungsten electrode products, is the earliest production of non-radioactive tungsten electrodes product that is characterized by the low current conditions has excellent arc performance , dimensional arc current is small . Therefore, it is commonly used in pipes, stainless steel products and welding of small precision parts . Conditions at low current DC electrode diameter 2.0mm or less , cerium tungsten electrodes thorium tungsten electrode is preferred alternatives.

Grade , Composition, Color , Work Function

Model grades Added Impurity Impurity quantity% doping doping % Other Impurities% of its

He miscellaneous mass % Tungsten% tungsten % Electric discharged power Color sign electron work function color

WC20 CeO2 1.80-2.20 <0.20 margin The rest 2.7-2.8 Ash Grey

The advantage is cerium tungsten X- ray dose and antioxidant properties than thorium tungsten have been greatly improved ; electronic thorium tungsten electrode work function than about 10 %, the arc easier and better arc stability . Also cerium tungsten chemical stability, cathode spot is small, low pressure drop, burning and less , so is the most widely used TIG welding a tungsten electrode . Commonly used tungsten chemical composition and grade of pure tungsten W1 W ≥ 99.92 SiO2 ≤ 0.03 Fe2O3Al2 ≤ 0.03 Mo ≤ 0.01 CaO thorium tungsten WTH-7 W margin other impurities is not more than the total mass fraction of 0.15%.

Cerium tungsten WCe-20 W margin CeO1.8-2.2 SiO2 ≤ 0.06 Fe2O3AI2O3 ≤ 0.02 Mo ≤ 0.01 CaO ≤ 0.01 cerium tungsten low electron work function , high chemical stability , allowing current density, non-radioactive , is currently a commonly used electrodes of pure tungsten high melting and boiling points , easy to melt volatile , burning, cutting-edge , less pollution, but the electron emission is poor, is not conducive to the stability of arc burning. Thorium tungsten electron emission capability, allowing high current density arc burning more stable, but with a certain radioactive elements thorium , promote the application be affected. Zirconium tungsten electrode on the need to prevent contamination of the base metal under special conditions , you can use this tungsten . This is easy to maintain the hemispherical tip of the electrode , suitable for AC welding .


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
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Here is an excellent quick and short guide on how to avoid buying fake gold coins and fake gold bars, with some background on the recent scare stories about counterfeit coins sourced from China. By the way, never bite a gold coin to test it - you'll either ruin the coin or break your teeth.

It's good to read that fake bullion gold Eagles and fake gold Maples, at least, are extremely rare; but as for historical gold coins of very high value, fakes are more likely, since there is such a great potential profit over and above the gold value for the counterfeiters.
In dealing with the subject of fake gold bars, the author also gives the best informed account I've read about why the recent 'fake gold bars made of tungsten' story is an urban myth.

Gold plated Tungsten Product Manufacturer & Supplier: Chinatungsten Online - http://paper-weight.cn/
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