Products: 

 Name: polished tungsten needle / tungsten electrodes 

 Features: high quality, wear-resistant, long life 

 Brand: American Harris HARRISWELCO 

 Specifications: Cerium tungsten 

 Standard: Φ1.6 × 175mm 

 Packing: 10 / box 

 Application: suitable for a variety of welding guns, welding place TIG welding of various materials 

 Product information: 

 As the tungsten, which makes it very suitable for TIG welding and other work like this electrode material. In the metal tungsten in the rare-earth oxides to stimulate its electronic work function, making the tungsten electrode welding performance can be improved: better performance from arc electrodes, a higher arc stability, electrode burning rate is smaller. Usually there is rare earth cerium oxide additive, lanthanum oxide, zirconium oxide, yttrium oxide and thorium oxide and so on. 

 Cerium tungsten electrodes in tungsten after adding rare earth cerium oxide polishing powder metallurgy and rolling mill process made of tungsten products, is the earliest production of non-radioactive tungsten electrode products, the product is characterized by the low-current conditions with excellent arc performance, low-dimensional arc current. Therefore, it is commonly used in pipes, stainless steel products and welding of small precision parts. 

 Research: 

 High melting point of tungsten (3683 ℃ ± 20 ℃), strong electron emission, high elastic modulus, steam down, so long tungsten electrode is used as thermionic emission materials. Pure tungsten metal emission efficiency is very low and at high temperatures the formation of equiaxed recrystallized grains leaving the tungsten wire sagging, broken. To overcome these shortcomings, to adapt to new technologies of modern industry, new technology development, national materials research and development workers are working a variety of new electrode materials. Doped tungsten-based low number of electronic work function of rare earth oxides, both increase the recrystallization temperature, but also activate the electron emission. Rare earth oxides with excellent thermal electron emission ability of rare earth tungsten electrode material has been the alternative to the traditional radioactive thorium tungsten electrode material development direction. 

 Applications: 

 Tungsten electrodes for TIG welding, which is in the tungsten matrix by the powder metallurgy method of incorporation of 0.3% -5% of the rare earth elements such as: cerium, thorium, lanthanum, zirconium, yttrium, etc. made of tungsten alloy, and then after pressure processing, the diameter from 0.25 to 6.4mm, standard length from 75 to 600, while the most commonly used specifications for the diameter of 1.0,1.6,2.4 and 3.2, the shape of the TIG extreme power is a critical factor when using DCSP, the power required to grind the extreme tip shape, and its angle with the cutting-edge applications, electrode diameter, and welding current to change, narrow joints need a smaller tip angle when welding very thin materials, the need low current, like the smallest needle electrode to carry out, to stabilize the arc, and proper grounding electrode ensures easy arc starting, good arc stability and weld the appropriate width. When AC power to the welding, grinding power without the extreme, since the use of appropriate welding current, extreme power will form half of the ball, if the increase in welding current, the electric light bulb-shaped and extreme changes to pollution of molten gold may melt. 

 Features: 

 Tungsten electrode in the arc in TIG arc starting, arc stability and weld quality have played an important role. In the arc of the tungsten electrode under high temperature mass loss occurs, known as tungsten electrode erosion. In order to facilitate discussion of the mechanism of tungsten electrode ablation, ablation can be added into the ablation and tungsten oxide itself ablation.