Refractory Metal Compositions
Stronger, generally harder, and having less conductivity, the refractory metal compositions include copper-tungsten (Classes 10-11), tungsten (Class 13) and molybdenum (Class 14) alloys.
The bars and inserts listed below are made in the following RWMA group B alloys: Class 10 (Tuffaloy 1W), Class 11 (Tuffaloy 10W), and Class 12 (Tuffaloy 20W).
Bars and inserts of Class 13 (Tuffaloy 100W) and Class 14 (Tuffaloy 100M), as well as special sizes and shapes, are priced on request.
COPPER TUNGSTEN ROUND BARS
Eight inches long, available in the following diameters:
From 1/8″ to 2″.
COPPER TUNGSTEN RECTANGULAR AND SQUARE BARS
Eight inches long, available in following dimensions:
Widths from 1/8″ to 2″ and Thicknesses from 1/8″ to 1″.
COPPER TUNGSTEN ROUND INSERTS
Available in following dimensions:
Diameters from 1/8″ to 2″ and Thicknesses from 1/4″ to 1″.
GROUP B REFRACTORY METAL COMPOSITIONS
RWMA CLASS 10 • TUFFALOY 1W
TUNGSTEN 55% – COPPER 45%, suited for facings and inserts for projection welding electrodes and flash and butt welding electrodes. It is recommended where (relatively) high electrical conductivity and some degree of malleability is desired.
RWMA CLASS 11 • TUFFALOY 10W
TUNGSTEN 75% – COPPER 25%, suited to similar applications as Class 10, and for facing on electrode forming electrodes. It is harder than Class 10, and is for general use in projection welding electrodes.
RWMA CLASS 12 • TUFFALOY 20W
TUNGSTEN 80% – COPPER 20%, suited for electro-forming and electro-forging facings, and for electrode facings used to upset studs and rivets. A material for heavy-duty projection welding electrodes.
RWMA CLASS 13 • TUFFALOY 100W (PURE TUNGSTEN)
RWMA CLASS 14 • TUFFALOY 100M (PURE MOLYBDENUM)
Class 13 & 14 materials are used primarily for welding or electro-brazing non-ferrous metals having relatively high electrical conductivity. They are suited to cross-wire welding of copper and brass, and for welding copper wire braid to brass or bronze terminals. Special set-ups and procedures are required.