Spot welding (Joule effect)
Temperature distribution in welding process
In spot welding process, we have two conductor parts (if possible with low resistivity) to be welded.
Two electrodes with different electric potentials are placed on each side of these conductor pieces with a given pressure. Due to the electromotive force applied to the electrodes, a current appears through them and in the conductor parts to be welded. These parts are heated and molten by joule effect. This heating, combined with the mechanical pressure results in welding. A typical temperature distribution during the welding process is illustrated on picture.