1. Electrode diameters, lengths and tolerances

Standard electrode diameters, lengths and tolerance are given in Table 1. Other diameters, lengths, and tolerances may be as agreed on between the supplier and the purchaser.

2. Electrode roundness

Electrode shall fit through ring gages sized for their maximum allowable diameter in accordance with Table 1.

3. Finish

Tungsten electrodes shall be supplied with a ground finish. The ground finish designates that the electrodes have been cleaned of impurities after they have been center-less ground to a uniform size. It shall be supplied with a bright, polished surface. The maximum surface roughness shall be 0.8 μm Ra[32 μmin AARH].

4. Electrode straightness

The electrodes shall be straight such that any element of its surface, over a specified length, must lie between two parallel lines of a specified spacing where the two lines and the nominal axis of the electrode of the electrode share a common plane. The specified spacing is 0.5mm[0.020 in] over a length of 100mm[4 in].



 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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Domestic heavy fuel always has high viscosity, high colloid, it will directly affect the combustion performance, such as decreases the quality of fuel atomization, leads to incomplete combustion of harmful gases contained in the flue gas increases and so on. In order to improve the quality of atomization and the combustion efficiency, some researchers consider energy conservation as their main goal. For the nozzle, to obtain droplets as fine as possible in the coverage of requirements is beneficial for accelerating the combustion. With the rapid development of science and technology, more suitable for fuel atomization technology, ultrasonic atomizing nozzles appeared. Ultrasonic atomization technology has smaller particle size (typically less than 100μm), the uniformity of the droplet is also excellent (N value is usually greater than 2, compared with ordinary burner N value 1.1-1.7).

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.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
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

In accordance with the following table, tungsten electrodes shall be marked on the basis of their chemical composition, with one color ring near one end of the electrode. The width of the color ring shall be at least 3mm [1/8 in]. Such color coding shall have no adverse effect on the operation or use of the electrode. Alternatively, tungsten electrodes may have their classification symbols marked on the surface of the electrode near at least one end of the electrode.

The ‘Chemical composition requirements for tungsten electrodes’ table is shown as bellow




 

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
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Recently, so many successes of high performance ceramics research provide new thinking for new nozzle developing. The new high-performance ceramic mostly apply submicron and nano powders, whiskers, fibers, chips, so that the grains and grain boundaries in combination between them have reached the nanometer level, and can be sintered at a lower temperature to achieve high density and high strength. In terms of sintering temperature, the products has lower 400 ° C sintering temperature than coarse-grained material and can withstand bending deformation without cracks at 180℃ sintering temperature.

In addition, some easy solution, immiscible components on the nanoscale composite can form a new composite material, which can improve the performance of hardness, toughness and wear resistance and other properties to a certain extent. When these techniques are widely in grinding compound nozzle, it will make a progress in jet flow nozzle and get a new breakthrough.

















Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.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
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn