Tungsten copper alloy is a kind of psudoalloy, which consists of the hard phase W and the binder phase Cu two immiscible metals, so it only can be fabricated by PM (Powder Metallurgy). Tungsten copper material has both advantages of tungsten and copper, the high density, high melting point, excellent wear resistance and corrosion resistance of W; the excellent electrical and thermal conductivity, good plasticity of Cu; and at a temperature above the melting point of copper alloy of copper liquefied evaporated to absorb a lot of heat, reducing the surface temperature. So tungsten copper material is also known as heat sink materials.

According to the shapes and applications, tungsten copper products can be specifically divided into tungsten copper rod, tungsten copper block, tungsten copper plate, tungsten copper contact, tungsten copper tube, tungsten copper electrode, tungsten copper heat sink, tungsten copper wire and so on. In the early 1960s, tungsten copper wire and tungsten copper electrode has been used in EDM (Electrical Discharge Machining) and resistance welding because of its high density, high strength, excellent electrical and thermal conductivity and arc ablation resistance. So far, with the developments of relevant technologies and further study of researchers, tungsten copper begin to use in plasma electrode material processing, precision machining, spraying, LED and other electrode fields. But since the special PM structure of tungsten copper, it has been greatly limited used in wire. In order to improve the uniformity, mechanical properties and production cost, it needs to looking for new technologies and processes.

Used in EDM electrodes of tungsten copper wires are supposed to meet the following requirements:
1. On the basis of excellent electrical and thermal conductivity, it also has good resistance to spark erosion;
2. Good structure uniformity and density, in order to ensure the stability of the electrical processing and improve the utilization of electrode material;
3. It has lower machining consumption and dose not affects the quality and the overall efficiency;
4. Easy for molding, machining molds and products according to design requirements to provide a correspondingly shaped profile tungsten copper electrode bars or complex shapes.

Except the technical requirements, testing standards of carbon sulfur analyzer and tungsten granule also include - test conditions, test methods, management of the results of treatment, re-testing period. The relative standard deviation of carbon is lower than 1.0%, sulfur should be lower than 4.0%, the analysis time should less than one minute, the weighing stability of less than 0.002 grams. Environment conditions for testing should meet the standards. The ambient temperature should be controlled between 15 ℃ to 30 ℃, relative humidity must be less than 80%. If it is measured against the amount of 0.0010% to 0.0100% of the carbon and sulfur, the relative humidity should be less than 60%. Power supply is (220 ± 4.4) V, (50 ± 1) Hz, and it should be ensured that the detection environment has no strong vibration, no strong electric, no active gases and without any impede of magnetic fields.

The main test equipments and materials for detection should be in accordance with national standards. Using the approved the steel components by the state metrological administrative department to analyze national primary, secondary reference material. Uncertainty of the determination of carbon and sulfur less than one-third of error of indication, weighing with 1g standard weights. According to visual indication and touch to detect the appearance of instrument. The instrument is required to be preheated on the basis of instructions before detecting. Select carbon content within the range from 0.100%  1.000%, and choose sulfur content within the range from the 0.010% to 0.100%, weighing 0.5 g of sample every time, repeated detecting for 7 times, calculating the standard deviation and relative standard deviation in according with the standard formula calculation method . Weighing with 1 g standard weight, continuously weighing for six times, the difference between the maximum and the minimum is called weighing stability. After the test is completed, certificate of qualification can be sent, if unqualified, pointing out that the failed project. Test cycle usually two years. While moving, repairing or doubting on the measurement results, users can test the instrument.

If the carbon sulfur analyzer used by the company are not included in the mandatory verification of measuring instruments catalog, on the other hand, these instrument are not applied in trade settlement, safety, health, environmental monitoring, there is no need to test it compulsively.