The Influence of the Bonding Area of welded Contact Tips on Contact Erosion

Author

Spath, Dietmar ; Behrens, Volker ; Finkbeiner, Michael ; Lutz, Oliver

Author_Institution

AMI DODUCO GmbH, Pforzheim

fYear

2006

fDate

25-27 Sept. 2006

Firstpage

181

Lastpage

187

Abstract

The influence of both the size and location of the bonding area of resistance-welded contact tips made of Ag/SnO₂ 86/14 on contact erosion was examined on an 11-kW AC contactor. AC4 utilization category at 110 A was used to perform the service life tests. It could be shown that the medium erosion rate was only slightly increased with bonding areas of down to 30%. The 90% erosion rate value, however, significantly rose with the decrease of the bonding area. Bonding areas of 30 and 40% resulted in partial early failure by the detachment of the contact tip. No remarkable influence of the bonding area to erosion values related to the arc moving direction could be determined. It was proven that the overtemperature value was evidently no function of the bonding area under the conditions specified in these tests.

Keywords

contactors; electrical contacts; failure analysis; life testing; silver; tin compounds; AC contactor; AC4 utilization category; Ag-SnO₂; bonding area; contact erosion; contact tip surface area; resistance-welded contact tips; service life tests; Bonding; Contacts; Geometry; Life testing; Magnetic switching; Manufacturing; Stress; Switching frequency; Voltage; Welding;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical contacts - 2006, proceedings of the fifty-second ieee holm conference on

Conference_Location

Montreal, QC

Print_ISBN

1-4244-0581-5

Type

conf

DOI

10.1109/HOLM.2006.284084

Filename

4063120