Re: What to use as crimp tool?

On Apr 20, 10:22 pm, JosephKK <quiettechb...@xxxxxxxxx> wrote:
On Tue, 15 Apr 2008 06:27:07 -0700 (PDT), MooseFET



<kensm...@xxxxxxxxx> wrote:
On Apr 15, 5:55 am, legg <l...@xxxxxxxxxxxxxxx> wrote:
On Mon, 14 Apr 2008 18:52:36 -0700 (PDT), MooseFET

<kensm...@xxxxxxxxx> wrote:
A proper crimping tool, applied as directed, is intended to produce a
gas-tight electrical contact, that is corrosion resistant at the point
of contact. This is supposedly impervious to fluids, as well.

The supposedly part of that theory points out one of its weaknesses.
I have seen crimp lugs turn green in the environment. The process of
crimping always leaves defects in the tin plating that can be where
the corrosion will start. A little solder closes these up and leaves
a joint with a smooth surface of only one metal.

This is where use of the proper crimping tool comes into play. The use
of the correct tool will often result in a recognizable signature
impression on the joint that is used for inspection/compliance and
quality control.

These crimpers made an impression that was inspected and everything
was just fine by eye. When put to use in the environment, they
failed. The best way to tell by looking is to look to see if it is
soldered. If it is not soldered, the joint will fail.

Just plain wrong. Good crimping _DOES_ require proper training, an
element most sorely lacking today.

Nobody could tell me how to do the training needed nor how to do the
inspection needed. The expensive tool was bought. It was a
recomended one. The person used as the maker of the tool said to.
The crimps failed in the field. Soldering solved the problem. When
we soldered the crimps the failures stopped dead.



Bare stranded copper grounding wires are used regularly in contact
with and buried in the natural environment . In this specific
application, the crimped contact is documented and demonstrated
regularly to outlast the conductors' lifetime.

100% of the joints that failed in China were crimped, 0% failures
were seen with soldered. This still applies today. I have seen no
failures in the crimp lugs that are soldered.

Because the soldered ones are 100% reliable and simply never fail, I
will continue with the method I use now. There really is no point in
your continuing to argue the point because I will continue to believe
the evidence of my experience.

That is your choice. Make it with my blessing. None the less, you
are in error, soldering a correct crimp decreases reliability.
Soldering a marginal crimp does increase reliability, but why are you
putting up marginal crimps?

I put up witht he marginal crimps because nobody can tell me how to
tell the difference between a marginal one and a nonmarginal one. The
only way to tell was to wait for them to fail.

When they got soldered, the reliablitiy was 100% in that we didn't
have a single failure after that. We had a set of instructions that
could be followed and the joint could be inspected so we had what we
needed.

.

Relevant Pages

  • Re: What to use as crimp tool?
    ... that is corrosion resistant at the point ... I have seen crimp lugs turn green in the environment. ... Soldering solved the problem. ... I put up witht he marginal crimps because nobody can tell me how to ...
    (sci.electronics.design)
  • Re: What to use as crimp tool?
    ... that is corrosion resistant at the point ... I have seen crimp lugs turn green in the environment. ... Soldering solved the problem. ...
    (sci.electronics.design)
  • Re: What to use as crimp tool?
    ... that is corrosion resistant at the point ... I have seen crimp lugs turn green in the environment. ... Soldering solved the problem. ... The schooling was not lost on me, ...
    (sci.electronics.design)
  • Re: I now prefer to crimp :)
    ... The really good ones crimp the insulation down as well. ... If you look around I've seen info on why soldering is bad from the ... were made by the manufacturer of the pins as I recall. ... crimp a wire, give it a little tug to make sure it won't fall out, ...
    (rec.games.pinball)
  • Re: AR9 speakers from about 1980.
    ... Decent crimping includes stress relief ... A good crimp will hold the bunch of strands ... off smoothly, so avoiding stress concentration. ... Crimping is far more intolerant of botching than soldering. ...
    (rec.audio.tubes)