Most welding applies
heat to join two pieces of metal. Gas welding produces molten metal through the
use of a gas flame. When the molten metal cools, the pieces are joined. Arc
welding uses an electric arc between the electrode and the work to melt the
metal.
Resistance welding
joins two pieces of sheet metal without adding anything. When an electrical
current is applied to the work pieces, for a predetermined time a nugget of
molten metal is created between the two pieces.
Resistant...
