General Use and Description of Group B & C
Physical Properties Group B & C Chemical Composition Copper Alloys Overview
| RWMA CLASS | RWMA NO. | RWMA GENERAL USE * | RWMA DESCRIPTION |
| 10 COPPER TUNGESTEN | C74450 | Flash and butt welding electrodes where good electrical and thermal conductivity is necessary and where a degree of malleability is desired. | A powder metallurgical combination of 45% copper and 55% of the refractory metal tungsten. Not a true alloy. This combination produces dense, hard metals of superior wear resistance and strength at elevated temperatures. In addition, they possess good thermal and electrical conductivity. |
| 11 COPPER TUNGSTEN | C74400 | Projection welding electrodes, flash and butt welding electrodes, light upsetting and seam welding bushings. Harder than Class 10 and used where moderate pressure is required. This material can also be used for spot welding low conductivity steels such as stainless. | A powder metallurgical combination of 25% copper and 75% of the refractory metal tungsten. Not a true alloy. This combination produces dense, hard metals of superior wear resistance and strength at elevated temperatures. In addition, They possess good thermal and electrical conductivity. |
| 12 COPPER TUNGSTEN | C74350 | Heavy duty projection welding electrodes, electro-forming and electo-forging electrodes facings for upsetting of studs and rivets, cross wire welding of large diameter wire and rod. | A powder metallurgical combination of 20% copper and 80% of the refractory metal tungsten. Not a true alloy. This combination produces dense, hard metals of superior wear resistance and strength at elevated temperatures. In addition, they possess good thermal and electrical conductivity. |
| 13 TUNGSTEN | C74300 | Cross wire welding of copper and brass, resistance brazing and some upsetting. Welding of braided copper wire to other materials. | Tungsten is extremely hard and has low ductility. It cannot be machined with cutting tools but can be ground to required contours. It does not alloy with nonferrous materials. |
| 14 MOLYBDENUM | C42300 | Cross wire welding of copper and brass, resistance brazing and some upsetting. Welding of braided copper wire to other materials. | Not as hard as Class 13 and can be drilled and machined to special contours. |
| RWMA CLASS | RWMA NO. | RWMA GENERAL USE * | RWMA DESCRIPTION |
| 20 DISPERSION STRENGTHENED COPPER | C15760 | Welding of metallic coated metal such as galvanized steel, terne plate, etc. | A powder metallurgy material consisting of copper and aluminum oxide with high temperature hardness and physical properties different than copper alloys. Not a true alloy. |
* General suggested applications, not to be interpreted as the optimum for any specific application.
RWMA Table 1.8.2
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