Non-destructive quality-testing of a joint between sheets made by electric spot welding

A method is described for the non-destructive testing of a joint obtained by the electrical spot-welding of two sheets of substantially the same material joined together in a local zone with the formation of a weld core which has a thermal diffusivity substantially different from the thermal diffusi...

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Hauptverfasser:	PALAZZETTI, MARIO, TUFANO, GIOVANNI, RE FIORENTIN, STEFANO
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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creator	PALAZZETTI MARIO TUFANO GIOVANNI RE FIORENTIN STEFANO
description	A method is described for the non-destructive testing of a joint obtained by the electrical spot-welding of two sheets of substantially the same material joined together in a local zone with the formation of a weld core which has a thermal diffusivity substantially different from the thermal diffusivity of the material of the two sheets before welding, such a core being obtained only when the welding is of a good quality. The testing is effected by a device the main characteristic of which is an electrode which delivers heat and a detector electrode located at two conveniently chosen points on one surface or opposite surfaces of the two welded sheets. The detector electrode is connected through an amplifier and an analog-digital converter to a computer which processes the signal to provide an indication of the weld quality on the basis of the measured value of the thermal diffusivity.
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subjects	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
title	Non-destructive quality-testing of a joint between sheets made by electric spot welding
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