I know I'm a little late on this subject but I just wanted contribute that
we have run testing and shown that the xrays do affect performance.
A few of my quality engineers tend to be very conservative and before we
could start using our HP 5DX automated xray imaging system of one of our
densest assemblies, we had to pass a test where we ran a known good
assembly thru the xray cycle 50 times.
Test parameters were documented before and after, with no detectable change.
At 06:33 PM 6/2/00 +0300, Gabriela Bogdan wrote:
>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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