Paragraph 4.1 (bottom of page 53) also lists as a Nonconforming Defect
for Class 1,2,3: The solder fillet has been damaged (e.g. fractured).
My interpretation of this is: If the solder fillet is indeed fractured,
it is a Nonconforming Defect.
Mary Muller
Materials and Processes
ELDEC Corp.
> ----------
>
> Greetings,
>
> Please assist in questions with 610 interpretaion:
>
> 4.2.2 - Nonconforming Defect - Class 1,2,3 - Evidence of fracture
> between
> lead and solder fillet.
>
> How does this requirement apply to leads that are NOT trimmed?
> The
> way I read it, this requirement is under the "Trimmed Lead"
> Section of the Soldering requirements. We have seen untrimmed leads
> that
> have evididence of a small seperation between the top of the
> fillet and
> the lead face when slightly bent. We have attempted to minimize
> this bending, but have not successfullly eliminated it. I would tend
> to
> think that the stresses on the fillet from a slight bend are
> far
> less than those caused by the shock of a cut.
>
> Nonconforming Defect: Yes or No?
>
> If nonconforming, is 4.2.2 the location of the definition by
> which it
> is nonconforming?
>
> If nonconforming, will rework result in superior solder fillet
> reliability (compared to Use As Is)?
>
> For that matter can a Nonconforming Defect (according to strict
> interpretation) be dispositioned UAI based on a judgement of
> defect
> severity? (i.e. 5.2 Nonconforming Defect - 1,2,3, - Assemblies shall
> be
> free of dirt, lint,dross,etc. - Does this mean that even a single
> piece
> of particulate matter is rejectable? Again I am assuming that this
> takes
> the definition to far, and the intent is simply clean boards. ) The
> foreward of 610 only mentions rework, repair, or scrap as options
> under
> Nonconforming.
>
> (BTW: since not trimmed, these leads do not get inspected at 10X.
> Some inspectors claim the fractures are not obvious under
> normal
> inspection magnification - 3 Diopter)
>
> This turned out kind of long so I will save other questions for my
> next
> Email.
>
> Thanks in advance and good day!
>
> Sean Hager
>
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