What is Resistance Welding?
History of welding technology
In ancient times, metal welding was done in the form of forge welding (metals heated up to melting point are pressed together) and brazing (weld using alloy of low melting point). With the advent of electricity, welding technology advanced remarkably; namely, resistance welding, arc welding and gas welding were invented in the end of 19th century. Thereafter, various welding technologies such as ultrasonic, friction, electron beam, plasma, laser welding have been invented.
Though we have very little chance to experience the welding technology, it is applied broadly in a variety of industries and contributed their growth.
Principle of resistance welding
Resistance welding is conducted as follows: Apply force and current through electrodes contacted metal parts to be welded; and resistance heat is generated at the interface of metal parts and makes a nugget, resulting in melt joint. Though a large current flows, there is no danger of an electric shock because only low voltage is impressed.
Features of resistance welding
Followings feature in resistance welding: