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Re: Acceptable thru-hole solder joints, IPC

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On 2017-05-24 11:30, speff wrote:
> On Wednesday, 24 May 2017 13:06:54 UTC-4, 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?
>>
>> -- Regards, Joerg
>>
>> http://www.analogconsultants.com/
>
> Doing some stuff with  J-STD for satellites-
>
> I don't have the IPC docs with me, but from a draft of IPC-A-610E
>
> Class 1 & 2 solder side minimum 270° fillet and wetting Class 3
> "        minimum 330°
>
> Class 2 component side minimum minimum 180° wetting on lead and
> barrel


Aha! Now we are getting somewhere. If you happen to be within reach of 
the IPC binder and have the time, could you look up which paragraph? I 
don't have IPC documentation because my stuff is usually governed by 
other standards and I don't have much to do with actual production.


> Class 3  "             minimum 270°
>
> Space/Military is Class 3/A, which adds some stuff to Class 3, mostly
> to do with staking and gold issues (replacing some older NASA etc.
> specs).
>
> Anyway, I would say if you can't inspect the fillet on the solder
> (secondary) side and verify it covers 270° at least, it would be a
> failure even for Class 1, and even if the primary side looks okay.
>
> Class 1:
>
> "This is the most lenient when it comes to allowing potential
> defects. Think of the electronics assembly in a very cheap toy, for
> example. The PCBA will be hidden well away within some stuffing or
> plastic enclosure and, as a result, the quality of solder joints or
> component positions won’t be a priority. It won’t be expected to last
> very long and often, has to be assembled to a specific price –
> usually translating to "as cheap as possible", whilst ensuring it
> still functions as expected."
>

This is more for commercial grade stuff.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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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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