Group B Refractory Metals
Refractory meterials are a combination of tungsten or tungsten carbide with copper and/or silver. The result is a very hard material with superior arc and wear resistance, and strength at elevated temperatures, yet retaining good thermal and electrical conductivity.
The mechanical and physical properties vary with the composition. The thermal and electrical conductivity increases with the amount of copper or silver, while the hadness, strength and resistance to mechanical wear increase with the amount of tungsten or tungsten carbide. The application will determine the material choice.
Class 10 Copper Tungsten (70% tungsten 30% copper)
|
Electrical
Conductivity
%IACS |
Rockwell
Hardness |
Ulitmate
Strength
PSI |
Cross
Breaking
Strength PSI |
Density
GMS/CC |
Typical Resistance Welding
Applications |
|
48 |
90B |
85,000 |
140,000 |
14.18 |
Light duty projection welding dies where weld pressures are medium. |
Other designations:
Ampcoloy 40, Elkonite 1-W-3, C1-W, C-10, Electroloy 10, H-10W, T-10W, Tuffaloy 10W, Weldtung 20CT, W-10W
Class 11 Copper Tungsten (75% tungsten 25% copper)
|
Electrical
Conductivity
%IACS |
Rockwell
Hardness |
Ulitmate
Strength
PSI |
Cross
Breaking
Strength PSI |
Density
GMS/CC |
Typical Resistance Welding
Applications |
|
46 |
98B |
90,000 |
150,000 |
14.70 |
Used for facings 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. |
Other designations:
Ampcoloy 42, Elkonite 10-W-3, C-10, Electroloy 10, H-10W, T-10W, Weldtung 20CT, Thermkon 83
Class 12 Copper Tungsten (80% tungsten 20% copper)
|
Electrical
Conductivity
%IACS |
Rockwell
Hardness |
Ulitmate
Strength
PSI |
Cross
Breaking
Strength PSI |
Density
GMS/CC |
Typical Resistance Welding
Applications |
|
42 |
103B |
98,000 |
170,000 |
15.4 |
Heavy duty projection welding electrodes, die facings for electro-forming and electro-forging, also facings for upsetting of rivets and studs |
Other designatins:
Ampcoloy 43, Elkonite 30-W-3, C-20, Electroloy 20, H-20W, T-20W, Weldtung 30CT
Class 13 Pure Tungsten
Other designations:
Ampcoloy 80, Elkonite 100W, C-T, Electroloy 100, H-100W, T-100W, Weldtung W
Class 14 Molybdenum
Class 13 and Class 14 materials are recommended principally for welding or electro-brazing nonferrous metals having relatively high elecrical conductivity. Cross wire welding of copper and brass wires and welding of copper wire braid to brass and bronze terminals are typical applications. Generally, special set-ups and procedures are required for this type of work.
Other designations:
Elkonite 100M, C-M Electroloy 500, H-14M, T-100, Weldtung M, W-100M
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