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Re: Acceptable thru-hole solder joints, IPC

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Joerg wrote on 5/26/2017 11:07 AM:
> On 2017-05-25 18:54, rickman wrote:
>> Joerg wrote on 5/25/2017 7:56 PM:
>>> On 2017-05-24 11:29, JM wrote:
>>>> On 24/05/2017 18:06, Joerg wrote:
>>>>> Folks,
>>>>>
>>>>> Just had a discussion with a contract manufacturer. They were of the
>>>>> opinion that a solder joint where there is complete circumferential
>>>>> inward capillary on the component side but regular wicking on the
>>>>> solder
>>>>> side is acceptable. This is consumer stuff and I am more used to the
>>>>> hi-rel industry where this is not deemed acceptable because nobody
>>>>> would
>>>>> know how deep the inward capillary action goes.
>>>>>
>>>>> I do not have IPC manuals and usually it does not apply to my stuff. A
>>>>> web search only brings up examples that talk just about one side at a
>>>>> time. Any pointers?
>>>>>
>>>>
>>>> IPC-A-610 class 2,3 would require >= 75% vertical hole fill.
>>>>
>>>
>>> I know but they don't talk about 360 degree capillary effect on one
>>> side. I don't mean a valley with would be ok and still wetted but really
>>> at the pin. In all companies I've ever been at that was flagged as
>>> unacceptable.
>>
>> At what kind of facility is this being soldered?
>>
>
> A contract assembler but I can't reveal which one.
>
>
>> My boards are built at a smaller facility and they typically find issues
>> on a few boards that get hand touched up to fix.  I spoke with a
>> Motorola guy back when they made a boatload of cell phones and he said
>> they don't do anything other than test.  So they optimize their process
>> so they have very few failures and little problem with reliability.  I'm
>> wondering what they can do to improve their process enough that it's not
>> worth doing either an automatic camera inspection.
>>
>> Seems to me it shouldn't be hard to control the process well enough that
>> defects are rare.  Any idea what can go wrong that causes these issues?
>>
>
> It's a hand-soldered part so probably dependent on who did the
> particular job. Their automated SMT soldering process is always nice and
> of superb quality.
>
> I am looking for some ironclad written standard. What I have seen in IPC
> usually talks about one side only, how the solder joint should look. It
> doesn't state cases where the solder side looks great but the component
> side indicates a potential failure down the road, only about barrel
> fill. I know when it can fail and usually does in the field but there is
> a slight "convincement issue" :-)

I thought the link JM posted had the full spec including both sides.

-- 

Rick C

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Thread

Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-24 10:06 -0700
  Re: Acceptable thru-hole solder joints, IPC JM <dontreplytothis173@gmail.com> - 2017-05-24 19:29 +0100
    Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-25 16:56 -0700
      Re: Acceptable thru-hole solder joints, IPC rickman <gnuarm@gmail.com> - 2017-05-25 21:54 -0400
        Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-26 08:07 -0700
          Re: Acceptable thru-hole solder joints, IPC rickman <gnuarm@gmail.com> - 2017-05-26 12:36 -0400
            Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-26 09:53 -0700
  Re: Acceptable thru-hole solder joints, IPC speff <spehro@gmail.com> - 2017-05-24 11:30 -0700
    Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-25 16:59 -0700
  Re: Acceptable thru-hole solder joints, IPC JM <dontreplytothis173@gmail.com> - 2017-05-24 19:41 +0100
    Re: Acceptable thru-hole solder joints, IPC Klaus Kragelund <klauskvik@hotmail.com> - 2017-05-24 13:51 -0700
      Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-25 17:01 -0700
    Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-25 17:00 -0700
      Re: Acceptable thru-hole solder joints, IPC JM <dontreplytothis173@gmail.com> - 2017-05-26 02:04 +0100
        Re: Acceptable thru-hole solder joints, IPC Joerg <news@analogconsultants.com> - 2017-05-26 08:12 -0700

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