By pressurizing the object to be welded with an electrode and passing an electric current, Joule heat is generated to locally melt and join the pressurized part.
An electric current is passed through the electrode to the object to be welded, but since a copper alloy or the like is used for the electrode, the resistance of the electrode is lower than that of the object to be welded, and the temperature rise of the joint is relatively large. Only the work piece is welded.
Since heat is generated intensively at the joint, welding with less thermal distortion is generally possible in a shorter time than with arc welding.
