Bill,
First, I am one of the fabricators. Of course I have only been involved with
PCB's for a little over 1 and a half years. It is the goal of this company
to meet our customers expectations, so when we hear of a customers
dis-satisfaction with product we attempt to immediately address the problem.
Our customer returns have declined tremendously over the past twelve months;
however, when these happen we do as much research as possible including
requesting customer process data in order to make as informed decision as
possible.
Have we identified conditions occuring at the assemblers? Absolutely, and
most often they are willing to listen to our findings and make appropriate
adjustments there to correct it. We have also identified causes for these
problems within our facility. We make appropriate changes here as well.
It is our believe that we should work with the assembler/customer in order
to satisfy everyone's goals.
Franklin:
The reason why a new supplier is suggested is because I've had experiences
where I would show the defects to the board manufacturer and he would point
the finger at my process for the cause of the problem. Then I would direct
our purchasing folks to order the next set of cards from a different vendor
and guess what.... The problem goes away. Maybe your suppliers are willing
to investigate their processes as a possible cause, if you have suppliers
like this.... keep them!
Bill Kasprzak
Moog Inc.
> -----Original Message-----
> From: Franklin [SMTP:[log in to unmask]]
> Sent: Wednesday, November 10, 1999 8:15 PM
> To: [log in to unmask]
> Subject: Re: [TN] Voids after Wave-Soldering!
>
> Curious, why do some end users make comments about finding new suppliers
> when assemblers ask questions about probable board defects?
>
> Just curious is all, consider I notice this on some e-mail replies.
>
> Thanks,
>
> Franklin
>
> ----- Original Message -----
> From: Kasprzak, Bill (esd) USX <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, November 10, 1999 12:44 PM
> Subject: Re: [TN] Voids after Wave-Soldering!
>
>
> Paul:
>
> Anytime I've seen volcanic type voids as you have described generally
> points
> to moisture trapped inside the board near the plated thru hole. Try baking
> a
> board for a couple of hours at 225° - 250°F, then re-run. If the problem
> persists then all I can say is that there are volitiles trapped inside
> your
> PWB and nothing can be done to remove them except to talk to your board
> supplier. (or find a new one !)
>
> Bill Kasprzak
> Moog Inc.
> > -----Original Message-----
> > From: Paul Tomlinson [SMTP:[log in to unmask]]
> > Sent: Wednesday, November 10, 1999 10:57 AM
> > To: [log in to unmask]
> > Subject: [TN] Voids after Wave-Soldering!
> >
> > Hi folks,
> >
> > I am just learning about these matters, and this is THE place where
> > knowledge and experience abounds so please somebody help me with this.
> >
> >
> > I have just had my first ever boards waved and the results are not
> > encouraging. What could be the cause of a volcano shaped void between
> the
> > component leads being soldered and the main body of the solder?
> >
> >
> > There is perfect continuity, the area at the tip and that around the
> board
> > are well wetted, but mechanically the joints are very weak and prone to
> > failure, the parts can actually be pulled out of the board without being
> > damage.
> >
> >
> > Could this be simply the result of a too low temperatured wave? They
> used
> > 465F.
> >
> > | |
> > | |
> > | |
> > --------------------- | | -------------------
> > | | | |
> > | | | |
> > | | | |
> > --------------------- | | -------------------
> > * * | | * *
> > * *V | | V * *
> > * * O | | O * *
> > * * I | | I * *
> > * * D | | D * *
> > * * | | * *
> > * * | | * *
> > * *| | * *
> > * | | *
> > *| |*
> > ---------
> >
> > This ASCII art is extremely crude so I have attached both JPG and BMP
> > files
> > of a much better drawing.
> >
> > Tia,
> >
> > Paul. << File: lead.bmp >> << File: lead.jpg >> << File: ATT15807.txt
> >>
> >
>
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