Tungsten contacts can act as electrical contacts or molecular materials. For example, in the switch circuit, they are used as a contact point or breaking point, and they can also be used for AC (Alternating Current) contactor contacts. Tungsten contacts material made of tungsten owning erosion resistance, high breaking current capacity, and good wear resistance. Therefore, tungsten contacts are widely used in agriculture, industry, science and technology and defense fields. Its specific applications include:
Communication machine contacts;              
Electric equipment for machine tool;
Relay contacts;
Shutter contacts;
Alarm contacts;
Automatic switching contacts;
Magneto contact breaker;
Electronic equipment, annunciator contacts;
Automotive electrical appliance contacts (distributor, speakers, sirens, voltage regulators, etc.).


 

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3. The parameter of rotary swaging mold could lowering the quality of tungsten points

When design the rotary swaging mold, the bearing length and ovality is not appropriately chose.
The control is inappropriate when repairing the mold, therefore, the two-part having inconsistent parameter, and they have bad finish, different size, and the arc between deformation zone and convergence aren’t in the same plane;

When repairing worn hammer, because the height of hammers vary one another among them and the highest point of the hammers don’t focus on the center line. So, when swaging, there will be deformation cause by uneven stress.


 

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3. The parameter of rotary swaging mode or repair problem can result in bad quality of tungsten contacts

The select of bearing length and ovality is not appropriate when design the rotary swaging mode.
The repair of the mode is not well controlled, so parameter of the two-part are inconsistent, they own different size, bad finish and the arcs between deformation zone and convergence are not in the same plane.

When trimming worn hammer, because the height of hammers vary among them and the highest point of the hammer is not grinding on the center line, so when swaging, deformation will occurs due to uneven stress.


 

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3. Inappropriate process design can influence the quality of tungsten points

In the process of pure tungsten blanks, crystals are not classified into fine crystals, coarse crystals and other crystalline, only processing temperatures changed.

In the swaging process, the heating temperature is not stable and feeding speed is not even. And in the tungsten blanks rounded process, the holding time is not appropriate.
The surface of tungsten rod is inappropriately alkaline washing.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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3. Inappropriate process design can bring about a bad effect on the quality of tungsten contacts

There is no classification on the process of pure tungsten blanks (coarse grain, fine grain and other crystalline), but only adopt different processing temperatures.
In the swaging process, the heating temperature is fluctuant and feeding speed is uneven. And increasing appropriate holding time failed in the tungsten blanks rounded process.
Alkaline wash of tungsten rod surface is not appropriate.


 

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2. Inappropriate control of tungsten blanks granule can have an influence on the quality of tungsten points

Coarse grains, fine grains and other different crystalline existing in the sintered tungsten bar at the same time, to a large extent, this is due to uneven mixing or the inappropriate ratio of particle size of tungsten powder. Among which fine grains will be too burning, it will have an impact on processing performance of tungsten bars, and ultimately it will affect the performance of tungsten points.


 

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1. Metallurgical defect of tungsten blanks can have an effect on the quality of tungsten points

Metallurgical defects of tungsten blanks refer mainly to:
In the smelting process, the inside part of tungsten blanks form defects, such as, slag inclusions, pores and so on. What’s more, some of these defects are difficult to preclude even in pressing process. For example, in the crystal boundary, there is the distribution of Ni, Fe and other impurities or compounds. The combination of grain surface is damaged due to these impurities, pores and other defects. So its metal bases are not continuous, it will result in the generation of cracks or tears of tungsten blanks in the process, and eventually lead to its final product --- tungsten points’ split and brittleness.


 

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Physical characteristics of scheelite/calcium tungstate:

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Powellite, CaMoO₄, is isostructural with scheelite which is why it forms similar crystals. The two minerals form a series in which the tungsten of scheelite is substituted for by the molybdenum of powellite. Powellite fluoresces a yellow color while scheelite fluoresces a bright blue under short wave ultraviolet light. Of course since molybdenum can substitute for tungsten, some scheelite specimens will show a yellow fluorescence.

The crystals of scheelite can look like fluorite octahedrons which can also fluoresce. However, fluorite has perfect octahedral cleavage and a lower luster. Massive scheelite has often been mistaken for massive quartz, but then the fluorescence of scheelite is a dead giveaway.

Many prospectors for scheelite have made good use of scheelite's typically bright blue fluorescence by searching for scheelite deposits by night with ultraviolet lamps. Many old mines have even been reopened after examination of the mine shafts with ultraviolet lamps have proven that the ore is not quite yet exhausted.

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