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June 1998

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Subject:
From:
Justin Braime <[log in to unmask]>
Reply To:
Date:
Fri, 26 Jun 1998 11:02:41 +1200
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Jason,
Have you sent a solder sample from your pot away for analysis recently? It
may confirm/deny the existence of impurities in the pot.

Justin Braime - Process Engineer
Alpine Electronics of New Zealand Ltd
----------
> From: <Jason M. Smith> <[log in to unmask]>
> To: [log in to unmask]
> Subject: Re: [TN] dross in the solder pot
> Date: Friday, 26 June 1998 08:07
>
> Experts, I am currently getting alot of failures at my functional tester.
> At my post solder station, I am noticing strings of dross across the pins
> of connectors.  We are having to dedross the pot daily....for a no-clean
> process and inerted atmosphering, I think this is a bit extreme.  Once,
an
> operator managed to accidently put stencil cleaner in the flux....could
> this cause a reaction unable to be corrected without dumping the pot and
> cause excess dross.  I initially thought we had too much exhaust drawing
> all nitrogen away from the wave.  Our flux manufacturer did analyis and
has
> determined that it's not the residues left which is causing my bridges at
> functional.  Is a type 'C' solder analysis going to tell me anything of
> significance to my problem from any of your experiences?  Any
> suggestions????
>
> Jason Smith
> Process Materials Engineer
> Lexmark Electronics
>
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