Projection Welding

Questions and Answers

Back up electrodes are used for projection welding electrodes. They are normally used on the lower side and are flat faced. There is no need for a defined weld face since the projection concentrates the weld current and heat into a desired spot for nugget creation.

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 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

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