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June 2000

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 2 Jun 2000 18:33:16 +0300
Content-Type:
text/plain
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text/plain (123 lines)
Dave,
Thank you.
As Steve pointed out, metal covers need more kV.
I am using an equipment of max. 160 kV and until now I was very happy with it, inviting
my friends to test BGA's with metal covers , their equipment being too weak.
I don't know if we should be happy or not having this discussion, but I have a bad
feeling. If there is something we don't know, research should be done.
I was just thinking that those who use the "best" equipment, are also those who
manufacture the assemblies which require the best quality.
Gaby

David Hillman wrote:

> Hi Gaby! The Xray equipment vendors have told me that Xray tubes that are
> less than 100kV have a very low probability of damaging components. Note
> the "very low probability" statement - they have not seen any customer
> issues with xray damage but they also can't totally rule out the
> possibility of damage. We have been using xray equipment with a 52kV tube
> and we have yet to have a xray damage issue. I imagine as industry use of
> xray inspection of area array increases we will find out how "probable"
> xray damage issue will be. And to add one more voice to the discussion - we
> have found the using a medium cost xray system (e.g. $30K-$60K) is a
> valuable asset in area array component solder process control. The use of
> xray equipment doesn't answer every question but having the tool available
> is important in several aspects.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
> Gabriela Bogdan <[log in to unmask]>@IPC.ORG> on 05/31/2000 11:31:58
> PM
>
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
>       to Gabriela Bogdan <[log in to unmask]>
>
> Sent by:  TechNet <[log in to unmask]>
>
> To:   [log in to unmask]
> cc:
>
> Subject:  Re: [TN] To X-ray or Not to X-ray.
>
> Hey, Paul!
> Now you got me scared. I hoped that Hals und Beinbruch was for good chance.
> You write
> about multiple passes, -in short, the process is time related. Do I have to
> fear that
> if the test takes a long time, I might damage good parts?
> Thanks,
> Gaby
>
> Paul Klasek wrote:
>
> > Take it from you Werner, glad you pull from golf to see us;
> >
> > 3D machine's orbiting view can see cracks from substrate,
> > with the kind human or inhuman experience you and Jerry noted;
> > with metal tops it could be still a hazy vision at the best ?
> > The likelihood of high efficiency top sinks (metal)
> > increasing popularity seems logical, to me (deluded or not),
> > meaning to be very interesting for multilayered patients diagnosis?
> >
> > Did you come across damage factors on X pass repetitions ?,
> > i know in med you can burn the bone with multipasses,
> > (know cases with 4-6 pass wrist X burns);
> > with the intensities required through the metal tops,
> > if they are Xable,
> > (wonder what's Altera's view on X,seen somebuddy here on Net,please,)
> > would there be a possibility of internal damage of ever finer paths ?
> >
> > I realize this is commercially sensitive laundry,
> > hints are good enough answers
> > (even no comment, come to think of it)
> >
> > paul
> >
> > -----Original Message-----
> > From: [log in to unmask] [mailto:[log in to unmask]]
> > Sent: Thursday, 1 June 2000 10:17
> > To: [log in to unmask]; [log in to unmask]
> > Subject: Re: [TN] To X-ray or Not to X-ray.
> >
> > Hi Paul, Steve & others,
> > It all depends on your volume and the level of assurance you need/want.
> > There
> > is no question that for some people's operation spending that kind of
> money
> > is overkill, on the other hand there is no question that X-ray inspection
> > with the proper recognition algorithm(s) and settings can improve the
> > quality
> > of the outgoing solder joints better than any other technique.
> > Werner Engelmaier
> >
>
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