Resistance spot welding method
US10328518B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2014 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Mar 24, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/24
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of resistance spot welding to join a plurality of overlapping metal sheets, including: dividing a current pattern into two or more steps for welding; before actual welding, performing test welding to store, for each step as a target value, a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume; and subsequently, as actual welding, starting welding using, as a standard, a time variation curve of the instantaneous amount of heat generated per unit volume obtained by the test welding, and when a time variation amount of an instantaneous amount of heat generated deviates during any step from the time variation curve by a difference, performing adaptive control welding to control a current passage amount in order to compensate for the difference during a remaining welding time in the step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.