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June 2013

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Subject:
From:
Steven Creswick <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steven Creswick <[log in to unmask]>
Date:
Tue, 11 Jun 2013 09:16:50 -0400
Content-Type:
text/plain
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text/plain (217 lines)
Yes, indeed!

How many times have we heard those very same words from vendors all over?

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Tuesday, June 11, 2013 9:02 AM
To: [log in to unmask]
Subject: Re: [TN] Dewetting on high current connector

I feel an indication of a sarcasm?




On 11 June 2013 11:35, Mike Fenner <[log in to unmask]> wrote:

> Yes, but first they have to say:
>
> Don't understand this we're not doing anything different No one else 
> has complained This is the first time we ever had this.
>
>
> Mike
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
> Sent: Tuesday, June 11, 2013 12:29 AM
> To: [log in to unmask]
> Subject: Re: [TN] Dewetting on high current connector
>
> What else is "new". :-(. I bet the supplier will say something like 
> "we can ship you a new batch".
> Regards,
>
> Vladimir
>
> SENTEC Testing Laboratory Inc.
> 11 Canadian Road, Unit 7.
> Scarborough, ON M1R 5G1
> Tel: (647) 495-8727
> Cell: (416) 899-1882
> www.sentec.ca
>
> -----Original Message-----
> From: Ed Popielarski <[log in to unmask]>
> Sender: TechNet <[log in to unmask]>
> Date: Mon, 10 Jun 2013 22:45:18
> To: <[log in to unmask]>
> Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
>         Ed Popielarski
>         <[log in to unmask]>
> Subject: Re: [TN] Dewetting on high current connector
>
> Inge,
>
> My customer stopped in to examine the suspect components at my request 
> today. He agreed that the terminals exhibiting dewetting are high risk 
> for his application, since it is integral with vehicle safety circuitry.
>
> It was revealed that the terminals in question were manufactured in 
> (you guessed it) China and the "good" terminals were domestic US.
>
> I think at this point we shall put this issue to rest until some 
> critical action becomes imminent.
>
> 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=0.0 11188,0.033023&ctz=420&t=m&z=16&iwloc=A
>
> From: Inge Hernefjord [mailto:[log in to unmask]]
> Sent: Monday, June 10, 2013 3:20 PM
> To: TechNet E-Mail Forum; Ed Popielarski
> Subject: Re: [TN] Dewetting on high current connector
>
> Well, Ed, did you get a backlash or do we continue troubleshooting?
> Inge
>
> On 10 June 2013 18:53, Ed Popielarski
> <[log in to unmask]<mailto:[log in to unmask]>> wrote:
> 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<tel:360-675-1322>
>                               Fx: 206-624-0965<tel:206-624-0965>
>                               Cl: 949-581-6601<tel:949-581-6601>
>
>
> https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&s
> pn=0.0 11188,0.033023&ctz=420&t=m&z=16&iwloc=A
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]<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<tel:360-675-1322>
> >                                Fx: 206-624-0965<tel:206-624-0965>
> >                                Cl: 949-581-6601<tel: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
> >
> >
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