Projection Welding Theory. The electrodes are flat. In theory set-down might be used as another indicator of weld nut torque limits but this presumes the projections are properly formed and the welding process is well controlled.
The projection is about defining a place where the weld joint should be created. This concentrated current on the small projected contact area generates. In projection welding the pieces are held together or clamped together between the electrodes and the pressure will be applied.
The electrodes are placed on work piece and current passed between them.
Collapsed during tltis stage Fig1c2. Project Report on the Practical Applications of Welding. The electrodes are placed on work piece and current passed between them. As the current flows through the welding zone of whichthe path is constrained by the contact the temperature around the projection elevates rapidly.