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Old 1st September 2007, 04:17 PM   #1
Did it Himself
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Question Lead soldering of leadfree parts

Is it OK to use lead solder to solder leadfree parts? Some of my inventory now is leadfree. I wonder whether I need to switch to leadfree solder - if I do will this solder the leaded parts good as well?
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Old 1st September 2007, 04:58 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
leadfree ends solder well with leaded solder.

I do not recommend using leadfree solder. I have found the few types of lead free that I have tested are not nearly as good at wetting the surface nor for working at as low a temperature.
This seems to be the general finding of others.
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Old 1st September 2007, 05:04 PM   #3
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Thanks Andrew. I know Lars Clausen had used some leadfree solder and said it was good, and worked just like leaded solder. But I have a reel of leaded that I might as well use.
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Old 2nd September 2007, 02:25 AM   #4
BWRX is offline BWRX  United States
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Quote:
Originally posted by AndrewT
I have found the few types of lead free that I have tested are not nearly as good at wetting the surface nor for working at as low a temperature.
I would echo Andrew's sentiment. The experience I have with circuit assemblies that were produced using Pb-free solder paste is that they are not as easy to rework because the Pb-free solder requires higher temperatures, does not wet as well, and does not always form a good solder joint. For DIY and personal stuff I only have 60/40 SnPb to use and it has always worked great.
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Old 2nd September 2007, 07:30 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi Bwrx,
if you think 60/40 is OK, then wait till you try 63/37 or even better 62/36/2Ag.
The disadvantage with both these is eroding of copper tips.
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Old 4th September 2007, 01:15 PM   #6
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Have you tried soldering large gauge cable that has been tinned with lead free solder?? You need to really wind up the temp (380 Deg+) to get a good connection, even when using lead based solder.
Lead free solder always leaves a dull finish, so it's difficult to tell whether you have a good solder joint, unless you trust your own abilities.
I agree with the others - stick to lead based solders if you can
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Old 4th September 2007, 02:25 PM   #7
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Quote:
Originally posted by AndrewT
Hi Bwrx,
if you think 60/40 is OK, then wait till you try 63/37 or even better 62/36/2Ag.
The disadvantage with both these is eroding of copper tips.

I have always used 60/40 and have a limited supply of 63/37 since I can't find any more of it here. but I really like using 63/37. never thought it erodes tips though.
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Old 4th September 2007, 11:39 PM   #8
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