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Tue, 13 Feb 2007 16:57:51 +0000 |
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Thanks Werner
The modern systems are far better.
BTW, can y'all stop sending us your rotten weather? We almost have
our own vapour phase over here.
Kindest regards,
Graham Naisbitt
[log in to unmask]
On 13 Feb 2007, at 15:28, [log in to unmask] wrote:
> Hi Graham,
> You are absolutely right, with the LF-solders, vapor phase
> soldering is the way to go, because of
> (1) assured uniform temperatures, everywhere, and
> (2) soldering just above Liquidus is possible avoiding the much
> higher peak reflow temperatures needed because of the thermal
> gradients resulting from all other heat transfer modes.
>
> Unfortunately, this technically very elegant way of reflowing
> solder got a black eye in its earlt history, because oven
> manufacturers designed their oven improperly in terms in
> insufficient pre-heating capability [resulting in solder pooling up
> component leads] and insufficient sealing [resulting in expensive
> vapor fluid losses].
>
>
>
> Werner
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