Solder Choices

S

Schroeder77

New member
This is my first post here. I've purchased a Crack which will soon be delivered, and I'm considering the best solder. 

In searching for balance between the easiest to use/best quality solder for this project, it seems Kester 44 63/37 (which makes it eutectic?) rosin core at a .031" diameter fits the bill.

Is this a good choice, and is the diameter appropriate?

I am grateful that there is a community for this kit building: I thought I'd be soldering alone, but now I see that soldering can be a joint effort.

I am so sorry for that. :-) I can't promise it's the last one either.
 
That sounds fine.  A small diameter solder allows you to put on how much you want to.  For me, large diameter solder heats up slowly and is always a blob when it liquifies.
 
I think you will be fine.  I just decided, in the end, to steer clear of silver solder.  Man that stuff can be hard to desolder if you mess something up.
 
You cant go wrong with Kester solder, using a cheap solder can be the most infuriating experience imaginable.

I bought a few meters of Cardas Quad Eutectic Silver solder to try and that stuff melts and flows like hot butter, virtually impossible to create a dry joint with it, just lovely shiny joints time after time. I was very impressed with it, but it does seem to have a lot of flux inside so lots of scrubbing is needed to clean the board after.  I haven't tried to unsolder any of it but i don't see why that would be an issue, if anything i think it has a lower melting point than regular 60/40.

Now led free solder, that is a royal PITA to unsolder...
 
Hi, I have a similar question, but am building a quickie.  The solder I have is Radio Shack rosin core 60/40.  Is that good for audio, or should I go with something more high-end?
 
Well, Paul Joppa has already responded so I think you are set, but that Radio Shack 60/40 is what I have been using since I started and I have never felt a need to upgrade.
 
Schroeder77 said:
This is my first post here. I've purchased a Crack which will soon be delivered, and I'm considering the best solder. 

In searching for balance between the easiest to use/best quality solder for this project, it seems Kester 44 63/37 (which makes it eutectic?) rosin core at a .031" diameter fits the bill.

Is this a good choice, and is the diameter appropriate?

I am grateful that there is a community for this kit building: I thought I'd be soldering alone, but now I see that soldering can be a joint effort.

I am so sorry for that. :-) I can't promise it's the last one either.
Click to expand...

Let's keep those dad jokes coming, lots of Dads around here i'm sure  8)
 
Paully said:
Well, Paul Joppa has already responded so I think you are set, but that Radio Shack 60/40 is what I have been using since I started and I have never felt a need to upgrade.
Click to expand...

Thanks for the feedback, I wasn't sure if Radio Shack was up for the job.
 
I have a followup question, just a bit divergent from my original thread topic . . .  Let's just upgrade the thread to "Solder(ing) Choices" in this case.

In my YouTube tutorial research, some people suggest putting a bit of solder on the tip of the iron a few moments before soldering each connection (called "tinning" the tip?). The primary justification was to better conduct the heat.

However, I saw another video of someone strongly suggesting not to do so, mainly because the rosin core burns away and throws off the balance of flux/solder. 

While both arguments seem plausible to a novice like me, I'm assuming the latter takes priority. Any opinions regarding this?

Also, here's what the Pace soldering training video seems to suggest the most of the process:

1. Heat to joint.
2. A bit of solder between heat and joint to "bridge"
3. Apply solder to other side, "painted on," allowing the flow to cover joint, remove while iron is still on
4. Pull away heat, do nothing (as in blow, let it move, etc.)

Steps 1-4 should take place within 2 seconds to avoid damaging the components.

Are there any additions, disagreements, or points of clarification that I seem to be missing here?

Should I instead make a new thread called "soldering technique?" I saw some related here threads that have been unused for quite some time.

Thanks again everybody!



 
I don't really think it's necessary to tin the tip before each joint.  The amount of solder that it takes to tin the tip is generally pretty minimal compared to the solder used for your average solder joint (except maybe on a PC board).

Once you've done a joint or two, your iron should stay relatively tinned.
 
There are two sides to this, the first as pointed out above is to clean/prep the tip so its got a nice shiny layer of solder on it.  This only needs done once in a while, you can tell by looking at the tip as it will go dull when it needs refreshed.

The second which i suspect is what the articles are aiming for, is to aid the thermal transfer between the iron and parts you are soldering.  For example for something with a large thermal mass like the body of an RCA socket having a little pool of solder on the iron greatly increases the surface area for the iron to conduct heat though. With a dry iron you could end up holding it on the socket for minutes wondering why your solder wont melt. Even for small through hole components a small dab of solder on the tip can help heat the board and part evenly allowing you to get in and out quickly.
 
My suggestion is stop reading and start soldering. It's an eye-hand coordination skill that you have to master by repetition. As you solder more you will develop a feel for the thermodynamics involved and when you need to pre-tin, reflow, add more, take some away, etc.

My small contribution to overthinking it is to suggest that figuring out the best position for the tip of the iron to quickly inject heat into both surfaces is oft overlooked and, I think, one of the keys to success.
 
Ok, I'll throw in. To start with you are heating up a terminal or tube pin AND a component lead.  You want these two to be hot so the pool of solder flows onto both.  Once you see this you know what I'm saying.

I "tin" the tip with just a small amount of solder, apply the iron with the liquid solder on it so it heats both pieces of metal (terminal, pin, component lead) and wait a few seconds for the cold metal to heat.  Then I put some solder on anything but the iron tip and see if the solder flows.  I add enough to cover both pieces, not necessarily closing the hole in the terminal/tube pin, then remove the iron.

Then I clean the soldering iron tip and place it in the spring holder.  I clean the tip after every joint!

And to add to Dan's comment, be careful not to lay the iron on other components!  It can ruin some of them.
 
Thank you for your advice. In fact, immediately after posting today's question I set up my newly purchased iron and took out the board and wire I bought to practice this week before I receive the Crack. So as of now I've got some practice in and I'm looking forward to more tomorrow.

Last time I soldered was for a theremin kit 15 years ago, and when it didn't work, I brought it to an electronics person who fixed "more than several" cold solder joints. I tried to look for them before bringing it to him, but I just didn't see it. I have better equipment now, more than enough theory from videos, I guess I'm just paranoid about my skills.

The soldering skill is the only critical component you don't provide in your box (ok and the ability to use a meter to check work), I'm just a bit obsessive about making sure it's there and waiting the day of delivery. Kind of like preparing the baby's bedroom. :-)

Thank you so much again everybody!

Duane
 
Doc B. said:
My suggestion is stop reading and start soldering. It's an eye-hand coordination skill that you have to master by repetition. As you solder more you will develop a feel for the thermodynamics involved and when you need to pre-tin, reflow, add more, take some away, etc.

My small contribution to overthinking it is to suggest that figuring out the best position for the tip of the iron to quickly inject heat into both surfaces is oft overlooked and, I think, one of the keys to success.
Click to expand...

Late to the party, I know.  I am a real noob at soldering, missed the day we covered it in metal shop, around '78.  ;D Tried a couple of times last year with the kit I bought that has a basic little 40w Weller iron, solder etc.  Found it quite difficult.

I'd seen YouTube videos etc. but still wasn't encouraged. Checked the specs of the kit I bought and learned they packed it with lead-free solder.  I took Doc B's suggestion above and sat down with an old circuit board, solder wick and some 63/37 solder.  What a difference !

By practicing on a bunch of joints it started to get easy !  The solder had a lot to do with that, but the timing needs to be right too it seems.  Looks like I just needed to practice on some non-critical stuff that I can make mistakes on and not be concerned.

Did the hardware assembly on my Quickie today, one more practice session soldering, and then I will finish up the Quickie.  Feel much more comfortable with the task, now that I've had some practice.  "Stop reading and start soldering."  It works.
 
Ok, this thread is old but interesting.
I got some Johnson's IA-423 solder as I built the Crack.
Now, with the Mainline coming over the Atlantic, I might
get to use it, anyone with experience  with Johnson's IA-423?
 
You must log in or register to reply here.

Similar threads

A
Moreplay, Crack and Attenuator DB Question
Replies
2
Views
3K
anthonynchandler
A
M
different color in the manual
Replies
3
Views
7K
Paul Birkeland
Paul Birkeland
A
Built my Crack and Now Need a Speedball for my Next Trick!
2
Replies
23
Views
21K
Mucker
Mucker
N
Resistances
Replies
19
Views
16K
Paul Birkeland
Paul Birkeland
T
Manual Updates?
Replies
3
Views
2K
thibodeaux
T
Back
Top