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
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV
> 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
> To subscribe: SUBSCRIBE TechNet <your full name>
> To unsubscribe: SIGNOFF TechNet
> ################################################################
> Please visit IPC web site (http://jefry.ipc.org/forum.htm) for
> additional information.
> For the technical support contact Dmitriy Sklyar at [log in to unmask] or
> 847-509-9700 ext.311
> ################################################################
>
################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE TechNet <your full name>
To unsubscribe: SIGNOFF TechNet
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################
|