Author Topic: help!! soldering brass tube  (Read 8680 times)

mick a

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help!! soldering brass tube
« on: March 10, 2015, 10:56:50 AM »
hi guys
was wondering if anyone new the best solder to use for brass tubing
i made a canopy for the ka3 (island models ) excellent kit
it was all good then one part came apart (heavy handed ) and then as i heated it all came apart !!!
i used silver solder and flux but it dosent want to flow it keeps running and ending up like tear drops
any ideas ??

rogallo

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help!! soldering brass tube
« Reply #1 on: March 10, 2015, 11:36:36 AM »
It is simple really. A high wattage iron with lead solder and flux that will heat the joint quickly without heating up the entire frame. And lots of patience.... :D
Spots or no Spots?
Tuff Choice.

Fred

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help!! soldering brass tube
« Reply #2 on: March 10, 2015, 13:01:25 PM »
Hey Mick,

Welcome to the forum :)

That's a bummer! But same as Ralph :)

Also, if this is looking like drops, that mean, to me, too much heat!
Heat the frame, not the solder if you see what I mean. But not red hot. The solder should melt by contact and go everywhere.
You can also sand the tubes a bit if you don't have flux. This might help also a bit, but the key here I think, is the heat applied.

When that do drops like this, this is not a strong bond unfortunately
Education is important, but flying RC planes and gliders is importanter!

mick a

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help!! soldering brass tube
« Reply #3 on: March 10, 2015, 21:00:10 PM »
hi
thanks for that
will give it another go 😄

johnfireball

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help!! soldering brass tube
« Reply #4 on: March 10, 2015, 22:16:53 PM »
Stick the pieces in a pot of sand, lined up with solder join protruding. when soldering the sand holds the other joints together and helps stop heat travel.
John. .
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EI1638

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help!! soldering brass tube
« Reply #5 on: March 11, 2015, 00:20:19 AM »
There is silver solder and there is silver solder

Generally in modelling when we talk about Silver solder we mean high melting point silver alloy solder for 'structural' soldering.

Lots of places sell 'silver' solder, but most of of them are talking about lead free solder, soft solder for electrical/electronic work. Not sure why its grown to be known as silver solder as it is a direct replacement for the old lead solder we knew and loved, with a slightly higher melting point. OK, there is silver in it, but its properties are intended to be very similar to the soft lead solder it supposedly replaces. Curiously, for high reliability electronic applications lead solder is preferred.

One of the dictats of soldering is that cleanliness is next to godliness, degrease then sand, and keep the pinkies away from the joint area if at all possible (to avoid skin oils contaminating the joint, not just to prevent burning the pinkies).

One thing I've found usefull is so called 'No Clean' flux. This looks like a thick marker with a fibre tip for applying the flux. Maplins carry this, as do Radionics. Only suitable for low temperature soft solder though.

Chris

mick a

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help!! soldering brass tube
« Reply #6 on: March 11, 2015, 15:18:24 PM »
thanks gents
all done now , the problem was i was using a flame on it instead of just soldering iron doh !!!!
all done now
 :D

mick a

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help!! soldering brass tube
« Reply #7 on: March 28, 2015, 18:07:17 PM »
here is result

mick a

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« Reply #8 on: March 28, 2015, 18:08:45 PM »
or maybe not !!!!
still cant upload pics

Fred

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help!! soldering brass tube
« Reply #9 on: March 28, 2015, 18:57:09 PM »
Hey Mick,

Your photos need to be 1000 pixels in size max.
If you have more issues, send them to me, and I'll post them for you :)

Fred
Education is important, but flying RC planes and gliders is importanter!