Electric heating – Metal heating – For bonding with pressure
Patent
1996-02-26
1998-02-24
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1125
Patent
active
057214158
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.
REFERENCES:
patent: 3191441 (1965-06-01), Erickson
patent: 4359622 (1982-11-01), Dostoomian et al.
patent: 5298711 (1994-03-01), Leon
Publication Schweissen und Schneiden 45 (1993) No. 6, (Faber et al.), pp. 308-313, "Temperaturmessung beim Widerstandsschweissen".
Fortmann Manfred
Kunnemann Volkhard
Greenberg Laurence A.
Lerner Herbert L.
Shaw Clifford C.
Siemens Aktiengesellschaft
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