Projection
welding is a resistance welding process that produces coalescence by the heat
obtained from the resistance to the flow of the welding current.
The resulting welds are localized predetermined points by
projections.
Projection welding uses the same equipment
as spot welding.
The electrodes used are flat and larger in diameter.
Successful projection
welding depends greatly on the surface preparation of the pieces to be
welded.
The weld point soon reaches the plastic state, and the force
applied by the electrodes finishes the weld.
Projection welding has been used by auto
manufacturers for many years.
Auto bodies have many areas that are projection welded.
Projection welding reduces the amount of current and pressure
required in order to form a good bond between two surfaces.
