Challenge tungsten dart ladder is yet another type of tungsten dart ladder. It is organized and played the same way with the following exception, players challenge their opponents to a match as opposed to one playing two, three playing four, etc. You can challenge either of the two people immediately above you (the person in 5th place can challenge either the person in 4th or the person in 3rd, nobody else). If you win, you take their position. If you lose, you stay where you are. You do not keep track of the number of wins each player has but all players must play one match/week. Once a player has been challenged, he/she can not challenge anyone else for that week. So it's first come, first serve. Get your challenge in as soon as possible so that you will have a chance to move up, instead of having to play to hold the position you're already holding. This can get a bit confusing and you can alter the rules in any fashion you deem necessary. One way to make this clearer is to let the lowest ranking person challenge first, then continue to work up the tungsten dart ladder until everyone has a match to play.

  Tungsten Dart Manufacturer & Supplier: Chinatungsten Online - http://www.chinadart.com/
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Due to the high thermal conductivity of Cu, and the better spark erosion resistance, low thermal expansion coefficient and high melting temperature of W, copper-tungsten electrodes have been widely used for machining die steel and tungsten carbide work-piece. The materials normally used in EDM electrodes are various types of copper, graphite, tungsten, brass and silver. But copper-tungsten has better properties. The low melting point of Cu reduces the resistance to electrode wear.

At high tungsten content, there is porosity in the liquid phase sintered electrode due to the insolubility between the Cu and W. This greatly impedes densification during the solution-reprecipitation stage of liquid phase sintering. Hence, this makes it necessary to introduce another material with high melting point. Materials having good electrical and thermal conductivity with a high melting point are used preferably in copper-based electrodes to resist electrode shape-loss.









Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com/
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Tungsten copper electrode is kind of composite metal material and is composed of high purity tungsten powder and good conductivity Cu powder through isostatic pressing and high temperature sintering. Therefore, tungsten copper electrode not only has high melting point(3410℃) and high density (19.34 g/cm³) of W, but also has good conductivity and other advantages of Cu.
 

In addition, tungsten copper has good thermal resistance, high thermal conductivity and low expansion, which can be partly used in resistance welding or electrical contacts. EDM and EDM is the most widely used tungsten copper as electrodes.

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com/
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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In World War II, projectiles made from tungsten alloys helped Allied forces achieve victory. Today, high-density tungsten alloys are still proving their worth in army applications around the world. The uncompromising strength found in tungsten alloys allows it to offer the highest quality in hyper-velocity, armor-penetrating applications, fragmentation devices and kinetic energy penetrators (in spheres, cubes and projectile shapes).

Tungsten has the highest melting point among all melts. The prominent advantage of high melting point is it produces materials with good high temperature strength and corrosion-resistance, which shows its excellent properties in army industry, especially in ordnance components manufacturing. With powder preprocessing technique and large deformation enhancement technique, tungsten alloys are refined to grains to increase the durability and penetrating force of materials.

There are some typical products made from tungsten:

Balanced ball for missile and plane

Core for armor-piercing shell

Tungsten alloy cluster bomb

Tungsten alloy gyro-rotor for airplane

Bullet of grenade

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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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