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October 2001

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Subject:
From:
"Dorothy M. Lush" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 9 Aug 2001 15:59:05 -0700
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text/plain (110 lines)
Also is this a double-sided board and are the solder joints in question on
the first pass side only or both sides (if a double-sided board)? The first
pass side can look great after 1st reflow but if it goes through a slow cool
on the 2nd reflow can get some extraordinary crystal growth depending on the
solder paste and it looks dull. What solder paste are you using and is the
questionable solder appearance random or at certain components?

Dorothy Lush
Manufacturing Engineer

> ----------
> From:         Andrew Hoggan[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Andrew Hoggan
> Sent:         Thursday, August 09, 2001 3:21 PM
> To:   [log in to unmask]
> Subject:      Re: Gold/Paste
>
> Hi Rick,
>
> could be;
>
> a) oxide on the joint
>
> b) change in the composition of the original solder through elemental
> contamination from your plating (pad/component) during reflow giving
> differential freezing, resulting in a change in the surface appearance
>
> c) the solder you've been supplied with is 'out of spec' (do you have a
> spec?) and is freezing differentially
>
> d) all of the above
>
> e) none of the above
>
> Best regards,
>
> Andrew Hoggan
> BBA Associates Ltd
> www.bba-associates.com
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Rick Howieson
> Sent: 09 August 2001 21:53
> To: [log in to unmask]
> Subject: [TN] Gold/Paste
>
>
> We are seeing cloudy/grayish smt solder joints on boards with immersion
> gold
> or soft body gold plating. Is this common???
> Thanks,
> Rick
>
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