Controls & Transformers

Questions and Answers

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.

Class 3 material is a designation of the Resistannce Welding Manufacturers Alliance (RWMA).  It describes a group of copper alloys with excellent strength and good electrical conductibity.  Class 3 is often used to weld stainless steel, nickel alloys and other highly resistive - strong materials that require high weld forces.

bar stock

Class 3 Bar Stock

Class 2 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA).  This is a group of copper alloys with high strength and electrical conductivity.  Class 2 is the most used material in the resistance welding industry.  As electrodes it is used for welding bare and coated steels.

bar stock

Class 2 Bar Stock

Class 1 material is a designation of the Resistance Welding Manufacturers Alliance (RWMA) which describes a group of copper alloys with good strength and high electrical conductivity.  Class 1 is often used to weld aluminum and other good conductors like brasses and bronzes which require high weld currents.

bar stock

Class 1 Bar Stock

Ohm's Law is the law of physics which expains the relationship between voltage, current, and resistance in an electrical circuit. It states:

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