Spot Welding
Questions and Answers
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 14 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA). It describes a pure Molybdenum material with good conductivity and excellent strength at high temperatures and forces. It is used as electrodes for cross were welding and electrobrazing.
Class 13 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA). It describes a pure tungsten material with good conductivity and excellent strength at very high temperatures and forces. Class 13 is the most heat tolerant of the refractory materials. It is used for cross wire welding and electrobrazing as the electrode material. High heat and force applications are where it does it best job.
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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