[sdiy] top soldering through hole

Candace Hazelwood candacemhazelwood at gmail.com
Wed Feb 14 21:15:14 CET 2018


I work at a microcontroller company PJRC and when we prototype we just wash the liquid flux off with running water for a few minutes and then put in oven at 150 for 20 minutes

Sent from my iPhone

> On Feb 14, 2018, at 11:13 AM, Jason Proctor <jason at redfish.net> wrote:
> 
> right - for nocturnal post-wash drying i've used a heat gun on the lowest setting - and usually from a distance!
> 
> 
> 
> 
> 
> 
>> On Wed, Feb 14, 2018 at 11:08 AM, Pete Hartman <pete.hartman at gmail.com> wrote:
>> Good point Jason.  I usually swing the board about and dry with a fluffy towel myself (rarely am I soldering during daylight).  If I was doing it 100% right I'd have an air compressor handy to blow dry it.
>> 
>>> On Wed, Feb 14, 2018 at 1:01 PM, Jason Proctor <jason at redfish.net> wrote:
>>> wash with soapy water, rinse with cleanest water available, dry in sun
>>> 
>>> the way to a shiny new flux-free board
>>> 
>>> 
>>>> On Wed, Feb 14, 2018 at 10:48 AM, MTG <grant at musictechnologiesgroup.com> wrote:
>>>> Wash with what and dry how?  I've never water washed a board before.
>>>> 
>>>> GB
>>>> 
>>>>> On 2/14/2018 10:29 AM, Jason Proctor wrote:
>>>>> same here -- 331 -> wash -> 44 for the rest. the boards are very clean and i've never had a single problem.
>>>>> 
>>>>> 
>>>>> 
>>>>> On Wed, Feb 14, 2018 at 10:15 AM, David Moylan <dave at westphila.net <mailto:dave at westphila.net>> wrote:
>>>>> 
>>>>>     I'm also using 331 water soluble for most components, then a board
>>>>>     wash.  Blame Paul Schreiber.
>>>>> 
>>>>> 
>>>>>     On 02/14/2018 09:13 AM, Ian Fritz wrote:
>>>>> 
>>>>>         I use Kester 44, never clean the flux, and boards I built 40
>>>>>         years ago are still fine.  Absorbs water? Corrodes? Somebody
>>>>>         please come over and show me, because I can't see any of that.
>>>>> 
>>>>>         Always solder from the top, too.
>>>>> 
>>>>>         Ian
>>>>> 
>>>>> 
>>>>> 
>>>>>         On 2/14/2018 8:59 AM, Quincas Moreira wrote:
>>>>> 
>>>>>             I use a local brand, Steren, 60/40
>>>>>             http://www.steren.com.mx/rollo-de-100-gramos-de-soldadura-con-aleacion-estano-plomo-60-40.html
>>>>>             <http://www.steren.com.mx/rollo-de-100-gramos-de-soldadura-con-aleacion-estano-plomo-60-40.html>
>>>>> 
>>>>> 
>>>>>             Yeah I guess it's not no clean, just regular leaded. I just
>>>>>             never felt like enough flux got on the boards to warrant
>>>>>             cleaning. I probably should though, if it's corrosive in the
>>>>>             long run. I've only been doing this for 7 years, maybe I'll
>>>>>             find out in 20 that I should have been cleaning all along!
>>>>> 
>>>>>             What should I use to clean then?
>>>>> 
>>>>>             Thanks Pete
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>>             On Wed, Feb 14, 2018 at 8:59 AM, Pete Hartman
>>>>>             <pete.hartman at gmail.com <mailto:pete.hartman at gmail.com>
>>>>>             <mailto:pete.hartman at gmail.com
>>>>> 
>>>>>             <mailto:pete.hartman at gmail.com>>> wrote:
>>>>> 
>>>>>                  What type of solder are you using?  Brand and model?
>>>>> 
>>>>>                  I use Kester 331 water soluble flux solder for early
>>>>>             components
>>>>>                  (stuff that can get wet), and it comes off the board
>>>>>             entirely with a
>>>>>                  brush (nylon bristles, like a really big toothbrush)
>>>>>             and warm/hot
>>>>>                  water.  Thing about it is, if I were using it on the
>>>>>             top and it were
>>>>>                  getting under components it would take more like an
>>>>>             ultrasonic bath
>>>>>                  to clean and get flux out from under resistors and
>>>>>             things, and if
>>>>>                  you don't clean it, the stuff is corrosive in the
>>>>>             longer run.
>>>>> 
>>>>>                  I finish up for things that can't get wet (pots etc)
>>>>>             with Kester 245
>>>>>                  no-clean.  It does leave some residue, but the main
>>>>>             point is that
>>>>>                  it's not meant to be cleaned off normally, and it
>>>>>             doesn't leave
>>>>>                  enough to look like some of the messes I've seen.  I
>>>>>             also use it for
>>>>>                  any top solder touch ups.
>>>>> 
>>>>>                  I've seen some really nasty work come across my
>>>>>             workbench for
>>>>>                  repair, stuff with 331 flux still on it after who knows
>>>>>             how long,
>>>>>                  stuff with ancient rosin flux with the black and brown
>>>>>             lava flows
>>>>>                  all over it.
>>>>> 
>>>>>                  I figure if you're not using no-clean, you'd know it :)
>>>>> 
>>>>>                  Pete
>>>>> 
>>>>> 
>>>>> 
>>>>>                  On Wed, Feb 14, 2018 at 8:15 AM, Quincas Moreira
>>>>>             <quincas at gmail.com <mailto:quincas at gmail.com>
>>>>>                  <mailto:quincas at gmail.com <mailto:quincas at gmail.com>>>
>>>>>             wrote:
>>>>> 
>>>>>                      I’ve never cleaned a board, ever... Maybe I’m using
>>>>>             no clean
>>>>>                      solder and didn’t even know it, I just never felt
>>>>>             the need. My
>>>>>                      builds look clean enough to me. Am I trippin’?
>>>>> 
>>>>>                      Sent from my iPhone
>>>>> 
>>>>>                      On Feb 14, 2018, at 07:33, Pete Hartman
>>>>>             <pete.hartman at gmail.com <mailto:pete.hartman at gmail.com>
>>>>>                      <mailto:pete.hartman at gmail.com
>>>>>             <mailto:pete.hartman at gmail.com>>> wrote:
>>>>> 
>>>>> 
>>>>> 
>>>>>                          On Wed, Feb 14, 2018 at 7:25 AM, Mattias
>>>>>                 Rickardsson
>>>>>                          <mr at analogue.org <mailto:mr at analogue.org>
>>>>>                 <mailto:mr at analogue.org <mailto:mr at analogue.org>>> wrote:
>>>>> 
>>>>>                              Top side is much simpler, I'll never go
>>>>>                 back - but
>>>>>                              probably a bit trickier to get clean from
>>>>>                 flux etc?
>>>>> 
>>>>> 
>>>>>                           I think this is the main reason I still
>>>>>                 primarily bottom
>>>>>                          solder, but I check my joints and if I have
>>>>>                 ones that didn't
>>>>>                          wick up to the top I'll touch them up with
>>>>>                 no-clean.
>>>>> 
>>>>>                          Pete
>>>>>                          _______________________________________________
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>>>>> 
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>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>>             --             Quincas Moreira
>>>>>             Test Pilot at VBrazil Modular
>>>>> 
>>>>> 
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>>>>> 
>>>>> 
>>>>> 
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