Coming Aussilek, if you can give me this: how much gas and water (maybe even Mango Tea) is included in a CuMo carrier with electroless Au/Ni? Size 1"x2" and 0.05" thick. We mount this carrier on a Al part by means of a polymer transfer (heat+pressure) and observe numerous gas bubbles. Brush-Wellman recommends isostatic  highpressure CuMo instead with higher (nearly 100%)metal content (less voids). Alpha Metals say there is no volatiles in their transfer, they think it's the CuMo carrier that behave badly. Vacuumbake in heat may help temporarily, but a couple of hours in the assembly environment, and I think mother Gaia will put back the gas, water and tea into the structure. Insane?/Ingemar


What's this non tech rumble mate ? lets get back to work :
Inge, you still owe us the analysis method adopted on those intermittents
you battled with (please) .
I'd love to know if that dye line worked ; or whatever else .

And , Kelly, the minute traces of Darjeeling tea in bulk of Jamaican rum
compromised in my grog (heated capped) should not sway you to deluded
assumptions.
Otherwise I agree with you ; takes a seriously confused lord to "improve"
otherwise decent tea with something like bergamon oil, some of us use as a
solvent (orange , ok , close enough).
And Swedes boil tea in milk !

As Carey says 'enough blabbering'
                                                                paul

PS
the PCB manufacturing saga was most enlightening ; thanks fellows

PPS
Do you have a picture Ioan , of that "cold" joint ?


Watch it Earl - that stuff'll rust your bloomin' plumbing!!  For all I know,
that might be what's wrong with our Aussie friend.




>I resemble that remark.

>
>> 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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