Method and apparatus for determining an evaluation time interval and method and apparatus for assessing the quality of a spot weld based on a variation in temperature in the evaluation time interval
US5721415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1996 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Feb 26, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/258
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for ascertaining an evaluation time interval for assessing the quality of a spot weld based on a course of a temperature at the weld, call for a course of a variable which is unequivocally associated with the temperature to be ascertained for a multiplicity of reference spot welds of differing quality, and for the courses of the variable to be compared with each other. A time interval which is determined from the comparison of the courses is used as the evaluation time interval, and the courses are significantly different from each other and have a sequence which corresponds to a sequence of the qualities of the associated reference spot welds. An allocation of the quality of any spot weld can be carried out simply and precisely by using values of the temperature-dependent variable within the evaluation time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.