Method and apparatus for the non-destructive checking of spot we

Details Method and apparatus for the non-destructive checking of spot we Method and apparatus for the non-destructive checking of spot we

1988-01-11

1989-12-12

Strecker, Gerard R.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 62, 324 64, G01R 2714

Patent

active

048870250

ABSTRACT:
A electrical current of predetermined strength is passed through a spot weld by a first pair of electrodes. The electrical potential difference between two points, respectively upstream and downstream of the spot weld along the current path, is measured with a second pair of electrodes. In particular, this second pair of electrodes is used to carry out at least one first measurement before the application of the current, and at least one second measurement during the application of the current. These measurements are carried out at two instants separated by a time interval equal to or a whole multiple of the period of the main power voltage. The difference between the values measured in the first and second measurements provides an indication of the quality of the spot weld.

REFERENCES:
patent: 3995213 (1976-11-01), Robinson et al.
patent: 4368422 (1983-01-01), Bachet et al.
patent: 4656595 (1987-04-01), Hognestad
Pivnichny et al., Four-Point Method Tests Solder Joints, 4-1975, Electronics, vol. 48, No. 7, pp. 106-107.

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