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May 2002

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Subject:
From:
Mel Parrish <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 16 May 2002 09:45:18 -0500
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Mornin Y'all
The new Cable and Harness specification, IPC-A-620 addresses this topic.
"4.1 Wire Preparation, Tinning
Note: Wires intended to be secured to threaded fasteners or crimp
terminations shall never be tinned."
There are other quotes if you would like to go back to the Mil Spec days.
The justification is pretty close although we will need to add "crimpified"
to the terms and definition committee agenda.


Mel Parrish
Soldering Technology International
102 Tribble Drive
Madison, AL 35758
256 705 5530
256 705 5538 Fax
[log in to unmask]
www.solderingtech.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Thursday, May 16, 2002 6:46 AM
To: [log in to unmask]
Subject: [TN] Crimped connections


All-knowing TechNet,

Yesterday I rejected some assemblies that had wires crimped into lugs and
attached to a TO-3 case. The inspector had noticed that the wires were also
tinned and then had been crimped. I said to rework based on the knowledge
that
we had never tinned wires to be crimped.

But when pressed for the reasons behind my decision, I was stumbling for an
answer. All I could come up with is that perhaps the crimp would be less
crimplified (new word) over time due to solder creep or temperature
excursions
since the solder might reflow to some degree.

What is the reason or doesn't it really matter whether tinned or not?

Did this Quality lug crimp his position as the local answer man?

Thanks to the forum,

Stu Korringa
Quality Engineer
Smiths Industries Electronic Systems
Grand Rapids, Mi.


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