Composite tungsten electrode is an electrode adding two or more rare earth oxides into tungsten, which are complementary to improve their welding performance. Therefore, they become extraordinary in electrode family. There are different standards for composite tungsten electrode. National standard IS06848 and American standard AWSA5.12 are two of them. The surface condition of composite tungsten electrode is glabrous, clean, no default (fissure, palling), no burrs, and no inner defects on the fracture surface and no oil fouling.

Certainly, composite tungsten electrode has other applications.
Nickel-tungsten- composite tungsten electrode in hydrochloric acid solutions
Composite electroplating is developing rapidly which has been widely used in industries. In view of the squandered metal in composite electrodeposits, for example, the squandered nickel in nickel-tungsten-tungsten carbide composite electrodeposits. Nickel-tungsten-tungsten carbide composite electrode can improve effects of the amount of codeposited tungsten carbide particles, temperature and concentration of hydrochloric acid on the anodic behavior of nickel-tungsten-tungsten carbide composite electrode in hydrochloric acid solutions.

 

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Composite tungsten electrode applied in welding, which is the same with other tungsten electrode. But they are different in welding industry. Since composite tungsten electrode owns slightness arc, big compression degree, the dissolves depth is biggest during welding at middle and big electric current, they are mainly used to war and aerospace industry.

Composite tungsten electrode in electrochemical catalyzed hydrogen evolution
Composite tungsten electrode can improve the electmehemical catalyzed hydrogen evolution of cobalt electrode. Cobalt – composite tungsten electrode was developed, and its property of electrochemical catalyzed hydrogen evolution can be showed by means of cathodic polarization curves, a. c. impedance technique and SEM. Compared with cobalt electrode, Cobalt tungsten electrode has rough surface, high exchange current density and smaller resistance of hydrogen evolution reaction. But composite tungsten electrode is clean and grounded that superior to cobalt electrode in electrochemical catalyzed hydrogen evolution. Thus, composite tungsten electrode are better choice in electrochemical catalyzed hydrogen evolution.

 

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In processing industry of rare earth and high-melting-point metal, swaging apparatus and process for multi-component composite tungsten electrode is a technology.Composite tungsten electrode can be prepared from composite tungsten rod, whose manufacturing process is shown as bellow:

Take Φ6.0 of composite tungsten rod as an example. At the temperature of 1450～1500℃, reducing Φ 6.0 of tungsten rod in a Φ 6.0-Φ 5.6 mold, an then Φ 5.6 of composite tungsten rod is formed. Following the same process, under 1400～1450℃:
1. Reduce Φ 5.6 one in a Φ5.2-Φ4.8 mold
2. Reduce Φ4.8 one in a Φ4.4-Φ4.1 mold
3. Reduce Φ4.1 one in a Φ3.9-Φ3.6 mold
4. Reduce it in Φ3.3-Φ3.0 mold; finally a Φ3.0 of composite tungsten electrode is manufactured.

What mentioned above are procedures of making Φ6 composite tungsten electrode material into Φ3 one. This method can be used to make composite tungsten electrode of other standards.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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Under the lower confining pressure, the velocity of broken volume decrease is faster. However, when confining pressure reaches a certain degree, the decrease scope reduces. With the number of pore increasing, aperture, depth and broken volume will decrease by the rising confining pressure. Different numbers of pores have different sensitivity to confining pressure. On one hand, too many pores will make each flow has little energy, smaller impact area and shorter spraying distance.

On the other hand, the ductility of rocks will promote with the increasing confining pressure, which turns brittle fracture into plastic collapse and all of them will increase the threshold pressure of jet-flow for cracking rock. Therefore, reducing pores appropriately under high confining pressure is beneficial for improving the efficiency of rock cracking.















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