Watch it Earl - that stuff'll rust your bloomin' plumbing!! For all I know,
that might be what's wrong with our Aussie friend.
Best -- Kelly
-----Original Message-----
From: pod <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Tuesday, October 05, 1999 12:37 PM
Subject: Re: [TN] Cold solder
>I resemble that remark.
>
>Earl Grey Great Tea
>----- Original Message -----
>From: Ingemar Hernefjord (EMW) <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Tuesday, October 05, 1999 9:52 AM
>Subject: Re: [TN] Cold solder
>
>
>> Earl Grey is a good tea, I agree,
>> Now, Joan, are you sure it's about cold soldering at all? As you describe
>it could as well be dewetting. If it's dewetting, your trouble shooting can
>leave the wavesolder for a while. Again, I wonder why you don't do a
wetting
>test on the terminals.
>> Good Lunch
>> Ingemar Hernefjord
>> Ericsson Microwave Systems
>>
>> ----------------------------------------------------------------------
>> Earl and all,
>>
>> the soldering was a lot better before. We've always had the QA on our
>back,
>> checking the flux density and the settings for the problem assemblies.
>> Myself, I don't recall having seen so much cold solder.
>>
>> The machine had been calibrated last saturday during the monthly
>> maintenance, when the pot is thoroughly cleaned.
>>
>> It's possible that the solder mask changed, since it's darker now.
>Together
>> with the soldering problems we started experiencing discoloration of the
>> solder mask on the solder side. But wouldn't this randomly affect any
>place
>> on the surface? I still get the connectors OK, with bad solder joints on
>the
>> caps and resistor networks.
>>
>> There has been no artwork change. However, could some changes in the
>> materials or manufacturing of the board affect somehow the thermal mass
>here
>> and there? I mean, maybe the connectors drain somehow the heat from the
>> adjoining components.
>>
>> And anyway, what on earth generates cold solder in the waving process?
>>
>> Ioan
>>
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