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1. (WO2018181397) WELDING DETERMINATION DEVICE FOR BELT-SHAPED SHEETS, AND WELDING DETERMINATION METHOD

Pub. No.:    WO/2018/181397    International Application No.:    PCT/JP2018/012579
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: B23K 11/06
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
PRIMETALS TECHNOLOGIES JAPAN, LTD.
Primetals Technologies Japan株式会社
Inventors: OKI Yuichiro
沖 祐一郎
SAKUMOTO Motoaki
作本 大朗
NAKAYA Takafumi
中谷 隆文
MITSUOKA Ryosuke
光岡 良祐
MITSUZUMI Tatsuki
三皷 達輝
Title: WELDING DETERMINATION DEVICE FOR BELT-SHAPED SHEETS, AND WELDING DETERMINATION METHOD
Abstract:
The purpose of this invention is to determine the occurrence of welding defects caused by quadrature current. This welding determination device comprises: a measurement unit (11) which measures the temperature of a junction of a belt-shaped sheet (steel belt (2), for example) to be joined by seam welding, and a determination unit (13) which, on the basis of the measurement results of the measurement unit (11), calculates the average temperature Tave at the junction and the temperature difference ΔT which is the difference between the maximum temperature and the minimum temperature at the junction, and deems a welding defect due to quadrature current to have occurred at the junction if the average temperature Tave is at or below a first threshold value, and the temperature difference ΔT is at or above a second threshold value.