spot welding


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Related to spot welding: Seam welding, Projection Welding

spot welding

[′spät ‚weld·iŋ]
(metallurgy)
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 ?
The intention of the measurements carried out was to gain fundamental knowledge about the character of the occurring dynamic forces on a spot welding gun .
Brown J, Widener C, Moore G, Poston K, et al., "Evaluation of swept friction stir spot welding in Al 2219-T6," in: Rajiv SM, Murray WM, Thomas JL, editors.
Parametric study of friction stir spot welding of aluminum alloy 5754, Metalurgija 53(1): 21-24.
Different studies deal with spot welding effected parameters; see [2-8, 15].
As an element of novelty and complexity, in order to increase the sustainability of contact spot welding electrodes was proposed the cladding by welding on the active area of layers enriched with carbides embedded in a copper matrix metal, thereby achieving a better consolidation and resistance to wear.
The conventional assembly method of side panels is spot welding, which is formed by about 233 spot points.
An appliance manufacturer has replaced spot welding of uncoated, coldrolled steel with TOX and eliminated the need to go through expensive degreasing stages prior to painting the finished housings.
Actually, the process of resistance spot welding is complicated, involving mechanical, electrical, thermal, and metallurgical problems, due to the large number of interrelated variables.
Laser welding is a non-contact process, so the tip maintenance required for spot welding guns is eliminated.
Remaining chapters discuss particular welding and joining techniques, including brazing and soldering, mechanical joining, adhesive bonding, gas-tungsten arc welding, variable polarity plasma arc welding, hybrid laser-arc welding, activating flux tungsten inert gas welding, friction stir welding, laser welding, resistance spot welding, and electromagnetic pulse welding of magnesium to aluminum sheets.
12 shows the influence of spot welded connections on the deformed shapes, their strength characteristics and distance between the spot welding.
For spot welding case (see figure 1) these dimensions and therefore the allowable stress depends on welding process parameters.