국제 및 국내 특허문헌 검색

1. (WO2004005913) METHOD AND DEVICE FOR ULTRASONIC TESTING OF SPOT WELDS, ESPECIALLY ON BODY SHEETS

Pub. No.:    WO/2004/005913    International Application No.:    PCT/DE2003/002151
Publication Date: Fri Jan 16 00:59:59 CET 2004 International Filing Date: Sat Jun 28 01:59:59 CEST 2003
IPC: G01N 29/38
G01N 29/40
Applicants: AGFA NDT GMBH
BUSCHKE, Paul
WAGNER, Joachim
Inventors: BUSCHKE, Paul
WAGNER, Joachim
Title: METHOD AND DEVICE FOR ULTRASONIC TESTING OF SPOT WELDS, ESPECIALLY ON BODY SHEETS
Abstract:
The invention relates to ultrasonic testing, wherein an ultrasonic testing head is coupled to the spot weld which is to be verified. At least one ultrasonic pulse is injected into the test weld where the attenuated pulse moves backward and forth between a front surface and a rear surface. The ultrasonic testing head receives pulses, which were at least once reflected on the rear surface, as echo signals. The echo signals thus received are amplified in an amplifier and subsequently evaluated in an evaluation unit. The evaluation unit only takes signals into account which correspond to an evaluation threshold. The echo signals are subdivided into a group of a higher order and a group of a lower order. The echo signals of a lower order include at least the first three echo signals. The sixth echo signal, preferably the fifth echo signal, belongs to the echo signals of the higher order. The echo signals of the higher order are amplified in the amplifier with a higher amplification factor and/or are evaluated with a lower evaluation threshold than the echo signals of the lower order.