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Copper Tungsten and Tungsten Carbide Copper
(CW55, CW60, CW65, CW70E, CW75, CW80)

Mi-Tech Tungsten Metals’ copper tungsten alloys are commonly used in EDM electrodes and other electrical and electrical/thermal applications. They are also used for facing and inserts for flash and butt welding dies, projection welding electrodes, seam welding bearing inserts and facing for electro-forming and electro-forging dies.

Although they are somewhat more difficult to machine, tungsten carbide copper materials provide high mechanical properties and excellent resistance to erosion. They are commonly used in oil devices to protect the contact from oxidation.

To learn more about which copper tungsten alloy is best for your application, contact a Mi-Tech Tungsten Metals professional.

Note: Our CW70E,CW75 and CW80 materials are readily available in various stocked sizes of rods and flat bars. Please see our updated parts document for information.

Material Density Conductivity Hardness
CW55 12.5 55 79 B
CW68 13.93 52 88 B
CW70 14.18 52 88 B
CW70E 13.93 52 88 B
CW75 14.7 48 94 B
CW78 15.12 46 96 B
CW80 15.56 44 98 B

MTTM Nominal Composition % Weight Rockwell Hardness Electrical Conductivity % IACS Ultimate Tensile Strength PSI Cross Breaking Strength PSI Density g/cc Typical Resistance Welding Applications
CW55 55% Tungsten 45% Copper 79 B 55 63,000 110,000 12.50 Flash and butt welding die inserts requiring high electrical and thermal conductivity. Electrode facings for the welding of stainless steel.
CW68 68% Tungsten 32% Copper 88 B 52 75,000 130,000 13.93 Flash and butt welding die inserts requiring high electrical and thermal conductivity. Electrode facings for the welding of stainless steel.
CW70E 68% Tungsten 32% Copper 88 B 52 75,000 130,000 13.93 Flash and butt welding die inserts requiring high electrical and thermal conductivity. Electrode facings for the welding of stainless steel.
CW70 70% Tungsten 30% Copper 90 B 50 85,000 140,000 14.18 Light duty projection welding dies where weld pressures are medium to light.
CW75 75% Tungsten 25% Copper 94 B 48 90,000 150,000 14.70 Used for facing and inserts for flash and butt welding dies, projection welding electrodes, seam welding bearing inserts, facings for electro-forming and electro-forging dies. Often used for EDM electrodes for greater wear ratios.
CW78 78% Tungsten 22% Copper 96 B 46 94,000 160,000 15.12 Used where a slightly harder material is required for the same applications as CW75.
CW80 80% Tungsten 20% Copper 98 B 44 96,000 170,000 15.56 Heavy duty projection welding electrodes, die facing for electro-forming and electro-forging, also facings for upsetting of rivets & studs.
SW50 50% Tungsten 50% Silver 70 B 65     13.4 Used for arcing contacts and plates, arc runners, and current carrying members
SW65 65% Tungsten 35% Silver 87 B 53     14.5 Used for arcing contacts and plates, arc runners, and current carrying members
SW74 74% Tungsten 26% Silver 90 B 47     15.5 Used for arcing contacts and plates, arc runners, and current carrying members

Domestic Manufactured Quality Tungsten Metal Products.
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