Re: solder vs crimp Re: MOT supply construction question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jonathan Peakall by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jpeakall-at-madlabs.info>

Jim,

I have seen this debate  before, but it seems as if the discussion centers
on solder VS crimping. What are the drawbacks of crimping AND soldering? I
have seen solder only connections "eject" the wire, I have seen many crimp
connectors "lose" the wire, but I have never seen a crimp and solder joint
fail for any reason other than extreme mechanical damage or heat, which
would have ruined things regardless of the nature of their connection.

Anyway, is there a failure mode that occurs only (or more often) when
soldered and crimped?

Regards,

Jonathan Peakall

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, October 12, 2002 11:00 AM
Subject: solder vs crimp Re: MOT supply construction question


> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jimlux-at-earthlink-dot-net>
>
> A couple interesting things to note about soldering vs crimping...
>
> crimping, properly done, produces a gas tight seal (important to prevent
> corrosion) between the conductors as well as good mechanical connection.
A
> good crimped connection deforms the metal sufficiently past the yield
point,
> but not too much, so that the "spring back" keeps the connection secure,
> even under thermal cycling (the coefficient of expansion of the two metals
> might be different) and vibration. I might add that casually getting the
$5
> crimpers out and cranking down on the connector is probably not "properly
> done".. you need fairly well machined tooling, the right equipment, and
raw
> connectors that are consistently manufactured.
>
> Soldering certainly does the gas tight seal (if done right), but,
remember,
> "solder is not structural".  It is quite brittle and work hardens.  If
> you're in an environment that has lots of thermal cycling and/or
vibration,
> soldered joints are more likely to fail, unless efforts are made to remove
> the stress from the solder joint (i.e. the wire is mechanically attached
> some other way).  There is also a fair amount of art and science in the
> selection of the particular solder alloy, the flux, and the cleaning
> process.
>
> One certainly can't say that, universally, solder or crimp is a better way
> to go.  One can bungle either..
>
> For the original question, I'd go with good quality crimp on spade lugs.
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, October 11, 2002 5:55 PM
> Subject: Re: MOT supply construction question
>
>
> > Original poster: "Jonathan Peakall by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jpeakall-at-madlabs.info>
> >
> > Mike,
> >
> > I should have mentioned, I crimp *and* solder. Good physical connection
is
> > important.
> >
> > Regards,
> >
> > Jonathan Peakall
> >
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Friday, October 11, 2002 2:55 PM
> > Subject: MOT supply construction question
> >
> >
> > > Original poster: "Michael Strube by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <mjstrube-at-earthlink-dot-net>
> > >
> > >
> > > I m in the process of constructing a MOT-based supply that will be
> > immersed in
> > > oil. I ve not tried this before, so here is a naïve question do the
> > connections
> > > that will be under oil need to be soldered? Up to this point, all my
dry
> > > transformers have just used the quick connects that are available on
> MOTs.
> > I m
> > > guessing that I need to solder those now if they will be in oil.
Thanks
> in
> > > advance for any help.
> > >
> > > Mike
> > >
> > >
>
>
>
>