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Some soldering guidance needed.
Some soldering guidance needed.
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Old 14th May 2014, 10:30 AM   #1
JDinkelman is offline JDinkelman  Netherlands
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Join Date: Apr 2014
Default Some soldering guidance needed.

So far my soldering projects have not gone further than cables. I am using Sn60Pb40 with no mention of a flux core on the package.

I have not had any issues with my cable soldering (apart from fiddling with smalle 3,5mm jacks) but is it correct that I should be using flux or is this more for plumbing?

I am about to build speakers and I need to solder a resistor and an inductor in parallel. Should I put the connecting wires in the same joint?

Is there really a risk when soldering to gold plated terminals?
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Old 14th May 2014, 11:05 AM   #2
nevillebartos is offline nevillebartos  Australia
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Quote:
Originally Posted by JDinkelman View Post
So far my soldering projects have not gone further than cables. I am using Sn60Pb40 with no mention of a flux core on the package.

I have not had any issues with my cable soldering (apart from fiddling with smalle 3,5mm jacks) but is it correct that I should be using flux or is this more for plumbing?

I am about to build speakers and I need to solder a resistor and an inductor in parallel. Should I put the connecting wires in the same joint?

Is there really a risk when soldering to gold plated terminals?
This is overkill for the task at hand but here's a good 3 (i think) part soldering tutorial, a good watch if you have the time

https://www.youtube.com/watch?v=J5Sb21qbpEQ
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Old 14th May 2014, 11:24 AM   #3
DF96 is offline DF96  England
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For electronic soldering you need a suitable flux, which is usually within the solder - the package should say so. Fluxless solder on its own won't work. Plumbing type fluxes will damage the components.
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Old 15th May 2014, 06:48 PM   #4
JDinkelman is offline JDinkelman  Netherlands
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My solder does appear to have a flux core and it flows very well.

I just did my filters. I stranded the pret-inned inductor and inductor wires together, then I ran the one of the joints through the pre-tinned hole of the lug from the binding post and soldered that as well.

I will probably not win any prizes but the joints have the same shine as the solder wire, I can still see the stranding, the ohmmeter says it's good and I can lift the coil with just the lug or the resistor so I guess it will do nicely.
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Last edited by JDinkelman; 15th May 2014 at 06:52 PM.
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Old 17th May 2014, 12:32 PM   #5
AndrewT is offline AndrewT  Scotland
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secure your coils so that vibration does not strain the copper lead outs.

repeated straining will fatigue the copper and eventually it will crack.
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regards Andrew T.
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Old 17th May 2014, 08:30 PM   #6
JDinkelman is offline JDinkelman  Netherlands
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The coils will be fixed with very strong (and vibration absorbing) double sided ashesive tape and the joints will not need to carry more than the weight of the resistor so I guess that should do it.

It's for a 3" full range speaker so the vibrations should not be too heavy anyway.
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Old 18th May 2014, 01:23 AM   #7
stratus46 is offline stratus46  United States
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Quote:
Originally Posted by JDinkelman View Post
My solder does appear to have a flux core and it flows very well.

I just did my filters. I stranded the pret-inned inductor and inductor wires together, then I ran the one of the joints through the pre-tinned hole of the lug from the binding post and soldered that as well.

I will probably not win any prizes but the joints have the same shine as the solder wire, I can still see the stranding, the ohmmeter says it's good and I can lift the coil with just the lug or the resistor so I guess it will do nicely.
Those connections did not get hot enough and it appears you may have tried to 'paint' with the soldering iron. When it gets hot enough, solder on the terminal will not have irregular areas and the surface will have a smooth contour with no 'high spots'.

It's actually hard to ruin parts by soldering if the tools are good. Bad tools get too hot and can't deliver heat fast enough so you tend to stay on the joint to long. Worse tools don't even deliver enough heat on any connection.

I use Weller Magnastats for many years and they are OK. I'm told Hakkos do better for less money. I currently run Metcals and will not give them up. After a Metcal, everything else is a soldering 'tusk'.

G
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Old 18th May 2014, 04:54 AM   #8
JDinkelman is offline JDinkelman  Netherlands
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Quote:
Originally Posted by stratus46 View Post
Those connections did not get hot enough and it appears you may have tried to 'paint' with the soldering iron. When it gets hot enough, solder on the terminal will not have irregular areas and the surface will have a smooth contour with no 'high spots'.
Do you suggest reheating the joint on the terminals to allow it to flow more evenly?

Quote:
Originally Posted by stratus46 View Post
It's actually hard to ruin parts by soldering if the tools are good. Bad tools get too hot and can't deliver heat fast enough so you tend to stay on the joint to long. Worse tools don't even deliver enough heat on any connection.

I use Weller Magnastats for many years and they are OK. I'm told Hakkos do better for less money. I currently run Metcals and will not give them up. After a Metcal, everything else is a soldering 'tusk'.

G
My iron is an entry level 30W. Upgrading to something more fancy is not really an option for me at the moment.
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Old 18th May 2014, 06:15 AM   #9
stratus46 is offline stratus46  United States
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Quote:
Originally Posted by JDinkelman View Post
Do you suggest reheating the joint on the terminals to allow it to flow more evenly?


My iron is an entry level 30W. Upgrading to something more fancy is not really an option for me at the moment.
If it were mine I would but it might get tricky unless the lug will stay in position even when the solder is liquid.

Sorry about the tools situation.

G
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Old 18th May 2014, 06:38 AM   #10
JDinkelman is offline JDinkelman  Netherlands
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No need to be sorry.



The joints do look better on the other side of the lugs.



The filters will be in an accessible position so I guess I wil leave them as is for now.
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