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A portable spot welder. Spot welding (or resistance spot welding [1]) is a type of electric resistance welding used to weld various sheet metal products, through a process in which contacting metal surface points are joined by the heat obtained from resistance to electric current.
Spot welding is a resistance welding method used to join two or more overlapping metal sheets, studs, projections, electrical wiring hangers, some heat exchanger fins, and some tubing. Usually power sources and welding equipment are sized to the specific thickness and material being welded together.
Resistance spot welding: 21: RSW Two pointed electrodes apply pressure and current to two or more thin workpieces Automobile industry, Aerospace industry Resistance seam welding [6] 22: RSEW Two wheel-shaped electrodes roll along workpieces, applying pressure and current Aerospace industry, steel drums, tubing Projection welding: 23: PW
In general, resistance welding methods are efficient and cause little pollution, but their applications are somewhat limited and the equipment cost can be high. [51] Spot welder. Resistance spot welding is a popular method used to join overlapping metal sheets of up to 3 mm thick. [51]
Processes such as gas metal arc welding, while often automated, are not necessarily equivalent to robot welding, since a human operator sometimes prepares the materials to be welded. Robot welding is commonly used for resistance spot welding and arc welding in high production applications, such as the automotive industry.
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