what is flux welding definition
Definition of flux. 1  1 : a flowing of fluid from the body: such asa : diarrheab : dysentery. 2  2 : a continuous moving on or passing by (as of a stream) 3  3 : a continued flow : flood a flux of words. 4  4a : influxb : change, fluctuation in a state of flux the flux following the death of the emperor.