spot welding

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spot welding

[′spät ‚weld·iŋ]
Resistance welding in which fusion is localized in small circular areas; sometimes also accomplished by various arc-welding processes.

Spot welding

A resistance-welding process in which coalescence is produced by the flow of electric current through the resistance of metals held together under pressure. Usually the upper electrode moves and applies the clamping force. Pressure must be maintained at all times during the heating cycle to prevent flashing at the electrode faces. Electrodes are water-cooled and are made of copper alloys because pure copper is soft and deforms under pressure. The electric current flows through at least seven resistances connected in series for any one weld (see illustration). After the metals have been fused together, the electrodes usually remain in place sufficiently long to cool the weld. See Resistance welding

References in periodicals archive ?
et al., "Numerical Prediction of Various Failure Modes in Spotwelded Metals," International Journal of Automotive Technology 13(3):459-467, 2012.
The numbers of spot-weld in foam-filled spotwelded columns are optimized by two methods.
The fluctuation of the values of SEA for (n > 10) is due to the highly nonlinear behaviors of crushing processes, because varying the number of spotwelds may result in different deformation modes and shapes [3].
Optimal crashworthiness design of a spotwelded thin-walled hat section.-Finite Elements in Analysis and Design, 2006, vol.
An appropriate spot-weld model was then used in the transient nonlinear finite element analysis (FEA), and the number of spotwelds was selected as one of the design variables in optimization.
In this simulation, a self-contact algorithm was used to prevent interpenetration during the folding of the columns and the spotwelds are modeled by surface-based tie constraints option in the Abaqus/Explicit.