Process and device for determining a temperature at a spot weld

Details Process and device for determining a temperature at a spot weld Process and device for determining a temperature at a spot weld

1996-02-26

1998-03-10

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219110, B23K 1125

Patent

active

057264090

ABSTRACT:
A process for determining a temperature at a spot weld formed between two parts being made of at least one first metal by at least one electrode being made of a second metal and being in contact with one of the parts, includes determining a first measurement value for a thermoelectric voltage between the electrode and the parts prior to forming the spot weld. A second measurement value is determined for a thermoelectric voltage between the electrode and the parts after forming the spot weld. The temperature is determined by taking both measurement values into account. A device for determining a temperature at the spot weld includes at least one volt meter for ascertaining a thermoelectric voltage between the electrode and the parts, corresponding to a temperature. A control unit records at least one first measurement value for the thermoelectric voltage prior to formation of a spot weld and at least one second measurement value for the thermoelectric voltage after the formation of the spot weld. A first memory stores the first measurement value and a second memory stores the second measurement value. A subtractor forms a difference between the first measurement value stored in the first memory and the second measurement value stored in the second memory and determines the temperature from the difference. Another process uses the device for evaluating the quality of a spot weld.

REFERENCES:
patent: 5298711 (1994-03-01), Leon
patent: 5399827 (1995-03-01), Fortmann
patent: 5495088 (1996-02-01), Leon
Publication Schwei.beta.en und Schneiden 45 (1993) No. 6, (Faber et al.), pp. 308-313, "Temperaturmessung . . .".

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