A welding cap is a special type of electrode used in resistance spot welding. Its primary function is to concentrate and transmit current to a specific area of the workpiece during welding. This creates a small and intense heat zone, melting the metals at the contact point and forming a weld between overlapping sheets. Welding caps are consumable materials and can wear out due to the heat and pressure generated during the welding process. They need to be periodically replaced to maintain optimum welding performance.
What Materials Are Welding Caps Made of?
Welding caps are typically made from copper alloys with high conductivity, often coated with zirconium. Copper provides efficient current transfer, while the zirconium coating enhances wear resistance and reduces adhesion between the electrode and the workpiece. Saglam Metal manufactures welding caps from Cupro Max, a copper-chromium-zirconium alloy, using the cold deformation method. Electrode caps produced through forging last much longer compared to those produced by machining. Their dimensional stability is maintained due to their production using molds.
Where are Welding Caps Used?
Welding caps are commonly used in automatic resistance spot welding applications. They are particularly used in the automotive industry to join sheet metal components in car bodies and other applications. They are also used in many other sectors involving spot welding processes, such as electronic manufacturing and device assembly, which include thin sheet metal welding.
Industries like automotive, white goods, and panel radiator sectors benefit from time savings during production with these electrode caps as they require less frequent revisions.
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