Projection Welding Vs Resistance Welding. Work-pieces are held together under pressure exerted by electrodes 4. While it can be also used to join thinner metal pieces together that tends to.
In projection welding one of the parts either the lid or the package case has a continuous metal projection that makes contact with the opposite part at the weld interface Fig. This process has the benefit of forcing the welds to occur in very specific and tiny locations and minimizing the dissipation. Are worked on same principle of heat generation due to electric resistance.
When a current passes through electric resistance it produces heat.
Like other Resistance Welding Processes Projection Welding uses heat generated by resistance to the flow of welding current as well as force to push the workpieces together applied over a defined period of time. Projection welding is one kind of resistance weld where the shape or design of the part is used to make subtle point contacts to concentrate the current during welding. Focused into the small area of the projection to produce heat at the desired weld location. This is same principle which is used in electric coil.