Today's Message Index:
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1. 09:14 AM - Re: solder splices (Robert L. Nuckolls, III)
2. 11:12 AM - Re: solder splices (Christopher Cee Stone)
3. 02:34 PM - Solder splices/connections (Christopher Cee Stone)
Message 1
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| Subject: | Re: solder splices |
At 06:55 PM 9/27/2016, you wrote:
>ok, away we go. i like my soldered joints more than any crimped
>joint cuz i made them.
Understand.
See http://tinyurl.com/dgg2nb if you haven't already.
Bob . . .
Message 2
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| Subject: | Re: solder splices |
The stress riser that occurs at the interface between wire strands and
solder filled wire strands if not mechanically supported is a candidate for
fatigue failure due to vibration induced flexing.
This is true of field splices and soldiered pin/wire connection.
Good mechanical support/strain relief is imperative to prevent fatigue
failure of the connection/soldier joint.
A good crimped connection does see a stress riser at the crimp/wire
interface... BUT the transition is not as sharp as with soldier wicked into
wire strands. Crimped pins the wire are generally supported upstream from
the crimp thus creating a mechanical support for the connection.
Chris Stone
On Tue, Sep 27, 2016 at 5:36 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 07:07 AM 9/26/2016, you wrote:
>
> hi all,
> =C3=82 i know solder connections are generally frowned on, especially in
engine
> compartment but my take on a solder splice in the middle of a 6'' run wit
h
> the wire bundled with 6 others is that it is totally satisfactory. am i
> wrong that solder is ok if you pick your application sites?
> =C3=82 bob noffs
>
>
> I don't know why it wouldn't be just fine ANYWHERE
> the materials, talents and tools are likely to
> produce a serviceable joining . . . irrespective
> of location.
>
> Soldering was 'frowned upon' on the 1960's
> production lines at Cessna because soldering irons
> burned people and melted carpets. At Boeing, I had
> to have a fireman come out and give me a permit
> to plug in an iron . . . just to make sure I wasn't
> working the task close to flammables. It's process
> sensitive (meaning you gotta have the moves).
> But an artfully crafted solder joint is no
> more/less risky to meeting design goals than
> a crimped connection.
>
>
> Bob . . .
>
Message 3
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| Subject: | Solder splices/connections |
The stress riser that occurs at the interface between wire strands and
solder filled wire strands if not mechanically supported is a candidate for
fatigue failure due to vibration induced flexing of the wire
This is true of field splices and soldiered pin/wire connection.
Good mechanical support/strain relief is imperative to prevent fatigue
failure of the connection/soldier joint.
A good crimped connection does see a stress riser at the crimp/wire
interface... BUT the transition is not as sharp as with soldier wicked into
wire strands. With crimped pins the wire is generally supported upstream
from the crimp thus creating a mechanical support for the connection. This
can be true for soldered joints as well... AS LONG as no solder has wicked
up the wire strands beyond the point of mechanical support. The finer the
wire strands (as in very flexible type conductors) the greater the
likelihood that solder will wick further up the strands potentially
going beyond the insulation.
Studies done here where I have been a test engineer on medical electronic
equipment have demonstrated the fragility of soldered wire connections.
All pins are crimped and strain relieved by connection of the wire outer
sheath to the connector body and by the cable outer sheath to the connector
shell.
Chris Stone
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