Spot Welding

Questions and Answers

Group C material is a designation of the Resistance Welding Manufacturers Alliance (RWMA).  It describes a group of Specialty materials with high strength and high electrical conductivity. Their properties make them excellent materials to use in the resistance welding industry as electrodes especially for galvanized steel.

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.

Group A material is a designation of the Resistance Welding Manufacturers Alliance (RWMA).  It describes a group of copper alloys with high strength and high electrical conductivity.  Their properties make them excellent materials to use in the resistance welding industry as electrodes and current carrying componenets used in the machinery of the resistance welding industry.

Class 11 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA).  It describes a Tungsten/Copper base material with good conductivity and excellent strength at high temperatures and forces.  Class 11 is often used as a back up electrode for projection welding.

Class 20 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA).  It describes a copper base material with high conductivity and good strength, similar to Class 2.  In addition it has better resistance to annealing and may have less tendency to stick to the work piece.  Class 20 is most often used to weld galvanized materials.

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