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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