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June 2013

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Subject:
From:
Ed Popielarski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ed Popielarski <[log in to unmask]>
Date:
Tue, 11 Jun 2013 16:58:07 +0000
Content-Type:
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text/plain (255 lines)
Well said, Mike!

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: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Tuesday, June 11, 2013 9:43 AM
To: [log in to unmask]
Subject: Re: [TN] Dewetting on high current connector [NTC]

NO - just a touch of world weariness. 

When I was small we used to play a game called "IT", others may know it as tag. The one who was "IT" used to chase everyone round the playground and tag touch someone then run even faster away. The tagged person was now it and they had to do the same. The last one to be touched was it.
Fast forward>> At work the last one to touch the job is the one that gets the blame. This means if you are in soldering you are usually IT! So you spend a lot of time identifying who should really be it. AS soldering is usually the last process this could be anyone in the supply chain. SO yes I have heard those words before. Very handy experience for when you are a consultant of course. You learn a bit about every manufacturing process there is as any one of them seems to have an impact on solderability in one way or another. 

Regards 
 
Mike Fenner
Bonding Services & Products
M: +44 [0] 7810 526 317
T: +44 [0] 1865 522 663
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Tuesday, June 11, 2013 2:02 PM
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&spn=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&spn=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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