Welding Of Projection. The welding cycle for spot seam and projection welding consists basically of four elements viz squeeze time weld time hold time and off time. This page introduces projection welding a method that adopts resistance welding principles.
It is named so because different projections are formed on the workpiece for effective welding. Galvanized steel terne plate tin plate etc. The most important variables of this assembly technique are the quality of the projections and the response of the cylinder as the projection collapses during the welding time.
In this welding process the design or shape of the part is used to make discreet individual contact to concentrate the current during the welding process.
And more and more manufacturers are using hot stamped boron steel like Usibor resulting in lighter weight components with increased tensile strength up to 1500 megapascals MPa. It is named so because different projections are formed on the workpiece for effective welding. One of the main differences between conventional sheet-to-sheet resistance welding and projection welding is that projection welding is a dynamic process involving considerable movement of the upper electrode. For this to occur successfully the tooling and machine have to be set up properly and operating efficiently.