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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.
Joining of soft alloys such as copper and aluminium below their melting point Electrical contacts Diffusion welding: 45: DFW No weld line visible Titanium pump impellor wheels Explosion welding: 441: EXW Joining of dissimilar materials, e.g. corrosion resistant alloys to structural steels Transition joints for chemical industry and shipbuilding.
Aluminium alloys are susceptible to hot cracking, and to combat the problem, welders increase the welding speed to lower the heat input. Preheating reduces the temperature gradient across the weld zone and thus helps reduce hot cracking, but it can reduce the mechanical properties of the base material and should not be used when the base ...
In general, resistance welding methods are efficient and cause little pollution, but their applications are somewhat limited and the equipment cost can be high. [45] Spot welder. Resistance spot welding is a popular method used to join overlapping metal sheets of up to 3 mm thick. [45]
Certification of companies for fusion welding of aluminum W48-14: Filler metals and allied materials for metal arc welding W55.3-08 (R2013) Certification of companies for resistance welding of steel and aluminum W59-13: Welded steel construction (metal arc welding) W59.2-M1991 (R2013) Welded Aluminum Construction CAN/CSA-Z662-15
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