Specification for Tungsten and Oxide Dispersed Tungsten Electrodes for Arc Welding and Cutting Abstract

This specification prescribes the requirements for the classification of bare tungsten and oxide dispersed tungsten electrodes for gas tungsten arc welding and cutting and plasma arc welding and cutting. Classification is based on the chemical composition of the electrode. Standard sizes, finish, lengths, quantities, product identification, color coding, and chemical composition limits are specified.

This specification makes use of both U.S. Customary Unites and the International System of Units (SI). Since these are not equivalent, each system must be used independently of the other.

This specification adopts the requirements of ISO 6848:2004 and incorporates the provisions of earlier versions of AWS5.12, allowing for classifications under both specifications.

 Lanthanated tungsten electrodes (yellow mark)

 

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Tungsten Carbide Venturi Nozzle Used in Shot Peening III

Tungsten carbide venturi nozzle has excellent uniform distribution of grinding compound. It is different with common straight type nozzle, which gathers the most of grinding compounds in the center of divergent area and narrow effective clean-up width, tungsten carbide venturi nozzle has wider effective clean-up width, more uniform grinding compound force. So that it can obviously improve the efficiency 15%--40% and reduce the consumption of the grinding compound.

In addition, there is a unique two-venturi nozzle, which has two nozzles at front and rear. Besides, there are some pores between two nozzles. Under the circumstances, it inhale surrounding air and make the volume of spraying is larger than the compressed air to accelerate the speed of grinding compound output. This diameter of two-venturi nozzle exit is longer than tungsten carbide venturi nozzle, smaller impulsion and 35% diverging area larger than normal nozzle so that the efficiency is improved.

 

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
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Tungsten Carbide Venturi Nozzle Used in Shot Peening

Shot peening process is similar to sandblasting processing, the only distinction is grinding compound is different and shot peening needs more air pressure. It is widely used in surface strengthen, polishing and deoxidation to eliminate forging residual stress which requires simple equipment, lower cost and not limited by the shape of material and the space. Shot peening materials contains cast iron balls, steel balls, glass balls and pottery balls, and the glass ball has high requirements, which should be above 6-7 Moh’s hardness. Otherwise, it will be fragile under high-speed impact and increase the cost. After shot peening process, the material will be harder, tougher and has better anti-corrosion and fatigue strength, extends their lifespan.
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Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
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Tungsten Carbide Venturi Nozzle Used in Shot Peening II

Tungsten carbide venturi nozzle structure can be divided into three parts, which is straight segment, shrinking segment and diffusion segment. So its process is more complicated than common nozzle. In terms of gas dynamics performance, tungsten carbide venturi nozzle is better than straight type nozzle, which has low pressure loss, improves vortex phenomenon. Under the same pressure, the speed of grind compound entrance can be up to 1 times higher than the normal, even close to the speed of sound. Therefore, the kinetic energy of the grinding compound has been remarkably improved, the impact has been significantly strengthened, which enhance the efficiency of tungsten carbide venturi nozzle and reduce the cost of production.
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Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
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Tungsten Carbide Nozzle Deep Cryogenic Technology III

Tungsten carbide nozzle is mainly composed of WC hard phase and Co binder phase. It is essential that hard phase ensure the high hardness, toughness and good heat resistance. While the binder phase has a polymorph characteristic, and usually plays a very important role in physical and chemical action in cemented carbide sintering process. X-ray diffraction analysis showed that the grain within tungsten carbide has structural change and increases the number of sub-grain boundaries per unit volume.

The sub-grain boundary structure is unique, which will enhance the shear stress plastic deformation resistance of the alloy so that the plastic deformation of tungsten carbide becomes difficult. Therefore, changes in internal microstructure reflected in the macroscopic properties change is to improve the ability of anti-abrasion synthetic polymers as well as its own resistance to abrasion, erosion resistance and service life have been significantly extended.
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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

 

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