DocumentCode :
3200559
Title :
Make arc erosion and welding in the automotive area
Author :
Morin, L. ; Ben Jemaa, N. ; Jeannot, D. ; Pinard, J. ; Nedelec, L.
Author_Institution :
PALMS Lab., Rennes I Univ., France
fYear :
1999
fDate :
4-6 Oct. 1999
Firstpage :
9
Lastpage :
16
Abstract :
A make arc has been investigated using a new testing apparatus. This apparatus which includes a piezotranslator, enables controlled bouncing to be studied at make under mechanical conditions similar to those encountered in automotive relays. Material transfer and welding tendency of silver, silver alloys and silver metal oxide contact materials have been studied under inductive, resistive and lamp loads at 14 V DC and 10-70 A. With all loads, anode to cathode material transfer has been observed, AgCdO, Ag and AgNi under lamp and resistive loads show the highest material transfer, as opposed to non doped and doped AgSnO/sub 2/ under inductive loads. This well known transfer is due to the anodic arc, which occurs during bounces when the gap between the contacts is shorter than /spl sim/5 /spl mu/m, at the beginning and the end of the bounce. We have demonstrated that welding occurs in the beginning of the bounce, i.e. when the contacts begin to separate under arc, and not when the contacts close under arc at the end of the bounce. It was found that welding occurs mainly with Ag, AgCdO, AgZnO, AgFeRe and AgFeOx contact materials, and under high inrush current produced by lamp loads.
Keywords :
automotive electronics; circuit-breaking arcs; relays; wear; welding; 10 to 70 A; 14 V; Ag; AgCdO; AgFeO; AgFeRe; AgNi; AgSnO/sub 2/; AgZnO; automotive relay; contact welding; inductive load; lamp load; make arc erosion; material transfer; mechanical bounce; piezotranslator; resistive load; testing apparatus; Anodes; Automotive engineering; Cathodes; Inorganic materials; Lamps; Relays; Silver; Surges; Testing; Welding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Contacts, 1999. Proceedings of the Forty-Fifth IEEE Holm Conference on
Conference_Location :
Pittsburgh, PA, USA
Print_ISBN :
0-7803-5549-0
Type :
conf
DOI :
10.1109/HOLM.1999.795921
Filename :
795921
Link To Document :
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