RE tungsten rod, used as welding electrode, its main welding performance indicators are arc properties and burning properties performance, arc experiment and burning experiment are carried out on the welding machine.

Arc experiment
Experimental materials: positive, water-cooled copper block; negative, tungsten electrode;
Experimental conditions: arc at high frequency; arc when electrode current is 60A; arc duration time is 10s, stopped arc time is 30s; prepare three electrodes each grade, each electrode repeat 10 times.

Burning experiment: The purpose is to measure the change in weight before and after the welding electrode.
Experimental conditions: electrode welding current is 160A; arc duration time is 20min; prepare three electrodes each grade, take the mean value.

First observe and analyze its burning surface with a scanning electron microscope (SEM), and then dig the electrode along the longitudinal sample to obtain metallurgical samples, and electrolytic polishing and erosion with NaOH solution. Finally, observe and analyze the organizational structure changes of three internal electrodes in SEM and EDS.



 

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Tungsten consumption from other electronic and electrical applications, including electrical contacts, electron emitters and lead-in wires, is forecast to grow at 5.4% per annum through to 2018, more than double the overall trend.

The resistance of tungsten to wear and corrosion and its ability to withstand arcing make it a suitable metal for use in contacts and voltage regulators. Demand from these applications however is minor in term of volume, meaning by 2018 their share of demand would only be 2%.

This report seeks to examine the financial viability or otherwise of mining tungsten ore 10% and processing same into tungsten ore 65%. Processing and separation of the tungsten would be done in any of the processing plant stated in the body of the report.

The business would entail using mechanized method of mining to produce 250 tons per month of tungsten ore in which minimum of 25 tons of 65% tungsten would be extracted.

In the above projections 100tons of rocks with 10% tungsten content will give 10 tons of pure 100% tungsten which should translate to approx. 15 tons of 65% grade but putting recoveries and loss of material during processing and to allow for low expectations associated with mineral processing. We use a 10 tons of 65% grade in our estimates, possibilities are there that we might be able to achieve more than 10 tons.

The required start-up capital estimate of the business is N 64,000,000.00 and it would be funded from 30% equity N 19,200,000.00 and 70% loan N 44,800,000.00. the loan would be  used to finance our purchase and installation of the production plant and the working capital.

 

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
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Email: sales@chinatungsten.com
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Experimental materials: A electrode (Y₂O₃: CeO₂: La₂O₃ = 1: 2: 1), B electrode (Y₂O₃: CeO₂: La₂O₃ = 3: 1: 1), cerium tungsten electrode.

Preparation of experimental electrode materials: Preparing rare earth tungsten billet by powder metallurgy method, add the rare earth rare in the form of earth nitrate solution (it should carry out several experiments to obtain the optimum amount - the total ratio of rare earth oxide in billet is 2% the amount of each rare earth oxides should meet the ratio, because when sintering, the loss of rare earth oxides vary each other) to blue tungsten oxide. Swaging rare earth tungsten billet repeatedly to the diameter of 3.8mm, and then stretching to a diameter of 2.0mm, and then after straightening, cut it into tungsten rod (length of 240mm). Polishing the end of the tungsten rod into cone (top diameter of 0.5mm), obtaining experimental electrode materials.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
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Tungsten, also known as wolfram, is a chemical element with symbol W and atomic number 74. The word tungsten comes from the Swedish language tungsten directly translatable to heavy stone.

Tungsten is a grayish-white lustrous metal, which is a solid at room temperature. Tungsten has the highest tensile strength. It has excellent corrosion resistance and is attacked only slightly by most mineral acids.

Tungsten（W）is a metal with a wide range of uses, the largest of which is as tungsten carbides in cemented carbides. Cemented carbides(also called hardmetals)are wear-resistant materials used by the metalworking, mining, and construction industries.

Tungsten metal wires, electrodes, and/or contacts are used in lighting, electrical, electronic, heating, and welding applications. Tungsten is also used to make heavy metal alloys for armaments, heat sinks, and high-density applications, such as weights and counterweights; superalloys for turbine blades; tool steels; and wear-resistant alloy parts and coatings.

Tungsten composites are used as a substitute for lead in bullets and shot. Tungsten chemical compounds are used in catalysts, inorganic pigments, and high-temperature lubricants.

Global tungsten demand has increased on average by 2.7% per annum since 2008, although estimates suggests that this will slow to 2.6% per annum in the years to 2018 as its direct use in lighting applications diminishes.

Representing 12% of total demand in 2013, tungsten used in lighting applications is forecast to decline by around 5% per annum in the year to 2018. the drop-off in demand is caused by the replacement of incandescent bulbs by fluorescent and LED bulbs in both industrial and domestic applications. On a positive note, however, these new lighting products require greater volumes of refractory tungsten alloys indirectly in their manufacture, boosting demand in the alloy sector.

 

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
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