Brian, There is no data yet on operational affects. I was hoping someone would have seen this before and did a study on the impact, and/or, an opinion. Thanks for sharing "It could worry me...". My gut tells me this is probably a bad situation, but just how bad is yet to be quantified. Ed Popielarski Engineering Manager 970 NE 21st Ct. Oak Harbor, Wa. 98277 Ph: 360-675-1322 Fx: 206-624-0965 Cl: 949-581-6601 https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A -----Original Message----- From: Brian Ellis [mailto:[log in to unmask]] Sent: Thursday, June 06, 2013 11:01 PM To: TechNet E-Mail Forum; Ed Popielarski Subject: Re: [TN] Dewetting on high current connector OK, what causes dewetting? It is caused by tinning a surface which is inherently solderable, but has myriad unsolderable points of small diameter. The commonest causes are the implantation of abrasive particles in the base metal, co-deposition of organics in a badly controlled plating process, gaps caused by epitaxial plating, selective oxidation. It could worry me, if the contacts in question overheated; have you measured a significant temp difference between a dewetting and a non-dewetting contacts at full current? Brian On 06.06.2013 21:59, Ed Popielarski wrote: > Greetings fellow 'netters, > > I have discovered a dewetting condition on high current blade connector(s) which causes me to raise an eyebrow. I can't find any scholarly articles discussing the long term effect such an irregular surface at the material contact interface (photo located at http://stevezeva.homestead.com/Terminal_de-wetting.JPG ) will have on connection integrity at high current. This is an extreme environment automotive application with MTBF expectations in excess of 10 years. > > Any guidance and/or professional opinions would be greatly appreciated. > > As always, thanks to Steve G. for sharing his webspace with us! > > Ed Popielarski > Engineering Manager > > [Description: FullLogo] > 970 NE 21st Ct. > Oak Harbor, Wa. 98277 > > Ph: 360-675-1322 > Fx: 206-624-0965 > Cl: 949-581-6601 > > https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&s > pn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________