Title:
METHOD FOR DETECTING EXPULSION IN ELECTRIC RESISTANCE WELDING, AND APPARATUS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/159815
Kind Code:
A1
Abstract:
The present invention comprises: a spot welding device 2 for welding a workpiece W, which is a stack of a plurality of metal sheet materials, by applying pressure on the workpiece W using a pair of electrodes 33, 34 and, while maintaining a predetermined force of pressure, passing electricity between the pair of electrodes 33, 34; an operation control unit 42 which detects, at a predetermined time interval, an interelectrode distance between the pair of electrodes 33, 34; a calculation unit 51 which detects a rate of temporal change of the detected interelectrode distance; and a determination circuit unit 52 which determines that expulsion has occurred when the detected rate of change in a direction in which the pair of electrodes 33, 34 become proximal to each other is not less than a predetermined threshold value.
Inventors:
NAWAHARA AKIRA (JP)
NAKAZAKI DAISUKE (JP)
NAKAZAKI DAISUKE (JP)
Application Number:
PCT/JP2019/004473
Publication Date:
August 22, 2019
Filing Date:
February 07, 2019
Export Citation:
Assignee:
MAZDA MOTOR (JP)
International Classes:
B23K11/24; B23K11/11; B23K11/25
Foreign References:
| JPH01241385A | 1989-09-26 | |||
| JP2002316270A | 2002-10-29 |
Attorney, Agent or Firm:
MAEDA & PARTNERS (JP)
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