Fault detecting device for welded pipe joints

Details Fault detecting device for welded pipe joints Fault detecting device for welded pipe joints

1986-09-10

1989-01-03

Paschall, M. H.

Electric heating

Metal heating

For bonding with pressure

219110, 219497, 219506, 219505, 219535, 1562742, 1563797, 26427211, 285286, H05B 102

Patent

active

047958774

ABSTRACT:
In an electron-fushion welding process a fault, e.g. due to incorrect assembly of the pipe joint components, is detected by sensing the welding current and emitting a signal to actuate an audible or visible alarm and/or to interrupt the welding process, if the welding current increases unexpectedly. A reference signal dependent upon the current dependent signal produced by the sensor and RMS to DC converter at a time t.sub.1 is held by a converter and is compared by a comparator with the current dependent signal transmitted through converter at subsequent intervals. So that the device does not react to transient current increase a delay arrangement delays the output signal for a given time.

REFERENCES:
patent: 3564204 (1971-02-01), Mense
patent: 4416713 (1983-11-01), Brooks
patent: 4421976 (1983-12-01), Jurek
patent: 4642154 (1987-02-01), Thalman et al.
patent: 4642155 (1987-02-01), Ramsey

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