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Tungsten copper alloys are used worldwide as electrodes for EDM (Electrical Discharge Machining) and ECM (Electrochemical Machining, and resistance welding electrode. All materials of tungsten copper electrode are manufactured by the press, sinter, and infiltrate process.
Advantages of Tungsten Copper Electrode
1. High thermal conductivity
2. Low thermal expansion
3. High wear resistance
4. Excellent electrical conductivity
Classification of Tungsten Copper Electrode
1. Tungsten copper (Class 10) is used for flash and butt welding electrodes in applications in which high heat resistance, higher electrical and thermal conductivity, high malleability, and low thermal expansion are required. This metal is created by combining 45% copper and 55% tungsten, resulting in a dense and hard metal with superior wear resistance and strength.
2. Tungsten copper (Class 11) contains 25% copper and 75% tungsten. Like Class 10, it has superior wear resistance and strength and good thermal and electrical conductivity. However, this tungsten copper resistance welding electrode is harder than Class 10 and used in applications that require moderate pressure. Common uses include projection welding electrodes, flash and butt welding electrodes, light upsetting and seam welding bushings, and spot welding low conductivity steels. Tungsten copper resistance welding electrode is also widely used in chip carriers, substrates, flanges, and frames for power semiconductor devices.
3. Tungsten copper (Class 12) contains 20% copper and 80% tungsten, being stronger than Class 10 and 11 tungsten copper, it is commonly used in heavy duty projection welding electrodes, and cross wire welding. It is also used in the liners of some specialty shaped explosive charges for the defense and oil and gas industries.
Performance of Tungsten Copper Electrode
Main Specifications of W-Cu Composite
| Type | Density | Conductivity | HB | Size |
WCu50 | 11.9~12.3 | ≥55 | 1130~1180 | Tube: Ø3~390 |
WCu40 | 12.8~13.0 | ≥47 | ≥1375 | |
WCu30 | 13.8~14.4 | ≥42 | ≥1720 | |
WCu20 | 15.2~15.6 | ≥34 | ≥2160 | |
WCu10 | 16.8~17.2 | ≥27 | ≥2550 | |
WCu7 | 17.3~17.8 | ≥26 | ≥2900 |
Typical Properties Heat Sink of W-Cu
| Material Composition | W-10Cu | W-15Cu | W-20Cu | W-25Cu | W-30Cu |
Density (g/cm3) | 17.1 | 16.4 | 15.5 | 14.8 | 14.2 |
TC (W/m·K) | 191 | 198 | 221 | 235 | 247 |
CTE (×10-6/K) | 6.3 | 7.1 | 7.6 | 8.5 | 9.0 |
Package and Transportation
We pack tungsten copper electrode in plywood case and send them by ocean or air.
