Abstract: Analysis method of ignition loss state was studied，aiming at the the problem of lacking quantitative as- sessment for electrode ignition loss in enameled wire resistance spot welding． Feature analysis was carried out by choosing dynamic resistance of electrodes as process information research object，and maximums of dynamic resist- ance during every ohmic heating process and the change rate with respect to the number of ohmic heating were ex- tracted as features of ignition loss state through． Analysis methods of ignition loss state based on state division and grey prediction were proposed and applied to analyze ignition loss experiments． The result shows that the chosen features can reflect ignition loss state of electrodes efficiently． Besides，the change of ignition loss state can be rec- ognized sensitively with the proposed methods，and different stages of ignition loss process can be analyzed quantita- tively without complex calculation and models trained and tested beforehand． Therefore，such methods can offer ref- erence for analysis research on electrode ignition loss in enameled wire resistance spot welding．

Key words: enameled wire resistance spot welding, lectrode ignition loss, dynamic resistance, analysis method