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Solder sleeve review...

 
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blues750



Joined: 06 Jun 2015
Posts: 46

PostPosted: Sat Jan 05, 2019 11:37 am    Post subject: Solder sleeve review... Reply with quote

Hey Gang, here is a pic of a couple of splices I did with Ray-Chem solder sleeves. I overlapped the two wire ends under the solder band and then used a heat gun with reflector set at 650. Was wondering if I should have tinned the ends prior to ensure better wetting of the strands. Open to comments and ideas. These wires are the three phase wires of a 30A PMA going to a R/R connector. In a previous post, I had some bad crimps and overheated some wires at the connector shell. This is part of the repair process. I am mainly interested if whether or not these are typically reasonable solder sleeve splices.
If not, any reason not to reheat the solder again? Crimp versus solder if I do this again?

Appreciate all thoughts and insights. Dave...


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PostPosted: Sat Jan 05, 2019 1:47 pm    Post subject: Solder sleeve review... Reply with quote

At 01:37 PM 1/5/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "blues750" <den_beaulieu(at)yahoo.com>

Hey Gang, here is a pic of a couple of splices I did with Ray-Chem solder sleeves. I overlapped the two wire ends under the solder band and then used a heat gun with reflector set at 650. Was wondering if I should have tinned the ends prior to ensure better wetting of the strands. Open to comments and ideas. These wires are the three phase wires of a 30A PMA going to a R/R connector. In a previous post, I had some bad crimps and overheated some wires at the connector shell. This is part of the repair process. I am mainly interested if whether or not these are typically reasonable solder sleeve splices.
If not, any reason not to reheat the solder again? Crimp versus solder if I do this again?

Appreciate all thoughts and insights. Dave...

Sure doesn't hurt. Depending on the age
of your wire and the solder-sleeves, activity
of the flux in the sleeve may be marginal.
Your shrink-and seal looks good so tinning
the wires is a good thing to try.

If you look through a solder-sleeve catalog

http://www.aeroelectric.com/Mfgr_Data/Terminals-and-Splices/Tyco-Raychem%20_SolderSleeves.pdf


you find a ton of part numbers differentiated
by the number and sizes of strands of wire being
poked into each end. The idea is that the solder-flux
ring needs to contain the optimum volume of flux and
solder to make up the joint.

When we by solder sleeves off eBay and mate up
with less than optimal wire, there is more risk
of not having enough solder than for having
too much.

Hence, your suggestion for pre-tinning is not
all that out of line. It's always a good idea
to make some practice joints with your proposed
materials thus reducing risks for the results
you've illustrated.


[img]cid:.0[/img]

You might also consider making a fixture from a pair
of alligator clips. Mash a flat in the barrel end and
solder them together at approx 90 degree angle.

This tool will keep things lined up while you do the
shrink-magic thingy while avoidign the BBQ thingy on your fingers.
This published installation guide . . .


http://www.aeroelectric.com/Mfgr_Data/Terminals-and-Splices/Tyco-Raychem_SolderSleeves_Installation.pdf

. . . as you may have discovered,
is a bit simplistic. A little practice and some shade-tree
tooling will raise the quality of your joints markedly.





Bob . . .


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blues750



Joined: 06 Jun 2015
Posts: 46

PostPosted: Sat Jan 05, 2019 4:31 pm    Post subject: Re: Solder sleeve review... Reply with quote

Thanks Bob! I did look at some NASA QC document with a few small pics regarding solder sleeve splices.

but...the question remains in my mind. Maybe something more definitive. Should I redo these splices or reheat? Can I do a resistance check and volt check though each wire to ascertain quality of splice? I would like to do a check for volts of each phase wire while running to see how close each phase is. I would go from the back of the connector to aircraft ground, use a 30 volt AC range on the meter. What I don't know is how much voltage to expect from each individual phase wire on a 30A PMA. Any general rules of thumb?

As always, appreciate the help and enlightenment!! Dave..


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PostPosted: Sat Jan 05, 2019 6:14 pm    Post subject: Solder sleeve review... Reply with quote

At 06:31 PM 1/5/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "blues750" <den_beaulieu(at)yahoo.com>

Thanks Bob! I did look at some NASA QC document with a few small pics regarding solder sleeve splices.

but...the question remains in my mind. Maybe something more definitive. Should I redo these splices or reheat? Can I do a resistance check and volt check though each wire to ascertain quality of splice? I would like to do a check for volts of each phase wire while running to see how close each phase is. I would go from the back of the connector to aircraft ground, use a 30 volt AC range on the meter. What I don't know is how much voltage to expect from each individual phase wire on a 30A PMA. Any general rules of thumb?

As always, appreciate the help and enlightenment!! Dave..

There are probably no risks for failure
for the joints you have . . . unless they
are exceedingly small area under the heat
shrink. There's no way to 'test' these
joints with measurements. You could cut away
the heat shrink and save the existing
stripped ends by heating them with an
iron and wiping them off.

Do you have any more sleeves?



Bob . . .


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user9253



Joined: 28 Mar 2008
Posts: 1350
Location: Riley TWP Michigan

PostPosted: Sat Jan 05, 2019 7:52 pm    Post subject: Re: Solder sleeve review... Reply with quote

One way to measure the resistance in a circuit is to connect a heavy load and
measure the voltage drop. An automotive headlight makes a good load. The
voltage drop depends on the wire diameter and length, but should be less than
1/2 volt. The theoretical voltage drop can be calculated using ohms law.
Measure the current and look up the wire resistance in a table.


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Joe Gores
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PostPosted: Sun Jan 06, 2019 6:17 am    Post subject: Solder sleeve review... Reply with quote

At 09:52 PM 1/5/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

One way to measure the resistance in a circuit is to connect a heavy load and
measure the voltage drop. An automotive headlight makes a good load. The
voltage drop depends on the wire diameter and length, but should be less than
1/2 volt. The theoretical voltage drop can be calculated using ohms law.
Measure the current and look up the wire resistance in a table.

But consider the 'fault' he is hoping to
detect. A 'poor' connection between the
two strands MIGHT have a very low cross
section but its LENGTH is near zero.

I'd venture to say that two joints in
identical wires, one with the desired
over-lap under the shrink and the other
simply tacked end-to-end on the strands
would be indistinguishable from each
other by external observation of
resistance.

I suspect his joints are electrically
adequate and with the mechanical support
of the solder-sleeve shrink, they'll
probably be just fine. However, one's
sense of craftsmanship may dictate
that they should be cut open, cleaned
up and corrected. It's easy to do.



Bob . . .


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blues750



Joined: 06 Jun 2015
Posts: 46

PostPosted: Sun Jan 06, 2019 8:11 am    Post subject: Re: Solder sleeve review... Reply with quote

Quote:
However, one's
sense of craftsmanship may dictate
that they should be cut open, cleaned
up and corrected.


Kinda what I was thinking... Embarassed Thanks to all who replied.
I have a another related "concern" to present to the group, just need to
figure out how to ask the question... Very Happy

Dave


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