Group B materials is a designation of the Resistance Welding Manufacturers Alliance (RWMA). It describes a group of Tungsten/Copper materials with high strength and good electrical conductivity. Their main feature is high strength at high temperatures. Their properties make them excellent materials to use in the resistance welding industry as electrodes at high heat and forces.
RWMA has subdivided the Group B into four Classes 10-14. Each class has different electrical and mechanical properties to fit the various requirements of the resistance welding industry.
Group B materials are expensive and are usually used as brazed facings on Class 2 backings.
GROUP B REFRACTORY FACED ELECTRODES
The product descriptions, properties and applications of these classes can be found in the Resistance Welding Manual in section 18-3, available through RWMA/AWS.
and
AWS Standard J1.3 Specification for Materials Used in Resistance Welding Electrodes and Tooling
Reference: RWMA: RWMA Manual, 4th Edition
AWS Standard J1.3 Specification for Materials Used in Resistance Welding Electrodes and Tooling