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June 2007

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TechNet E-Mail Forum <[log in to unmask]>, Hfjord <[log in to unmask]>
Date:
Sat, 9 Jun 2007 08:32:17 +0200
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Agree, we bought a vapour phase inline machine in order to secure the
BGA soldering. 
Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Werner Engelmaier
Skickat: den 9 juni 2007 02:07
Till: [log in to unmask]
Ämne: Re: [TN] SV: [TN] Z-axis expansion

Hi Dave,
This amount of rework, particularly at LF-temperatures, is not a good
idea as 
you surmised. That can consume upwards of 30% of the fatigue life of the

vias, provided they survive the procedure.
If you indeed to 'cold' solder joints—this would mean SJs near the BGA 
centers, you need to 'up' the soldering profile. Reworking these is
quite hard to 
do, bnecause it is difficult to get sufficient heat under the BGAs—that
is the 
reason why vapor phase soldering is making a come-back.

Werner



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