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Electrodes are available in many sizes and shapes to fit most needs in industry. To choose many considerations come to mind. The first decision would be full size vs cap electrode. Are you a job shop or highly automated usually decides this.
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 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.
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.
Class 2 Bar Stock
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