DISPOSITIF DE DÉTERMINATION DE SOUDURE POUR FEUILLES EN FORME DE COURROIE, ET PROCÉDÉ DE DÉTERMINATION DE SOUDURE

摘要

The purpose of this invention is to determine occurrence of expulsion in seam welding with high accuracy. A welding determination device includes: a measurement unit (11) configured to measure temperature of a joint portion between strip-shaped sheets (for example, steel strips (2)) to be joined by seam welding; and a determination unit (13) configured to, based on a measurement result by the measurement unit (11), calculate an average temperature T_aveand a temperature difference ΔT of the joint portion and, when the average temperature T_aveis more than or equal to a first threshold value that is set according to the sheet thickness of each of the strip-shaped sheets and the temperature difference ΔT is less than or equal to a second threshold value, determine that expulsion has occurred at the joint portion.