There is a marvellous product called "Chipquik" or "Chipkwik" or
similar, made by an american company I believe.

It is a solder alloy, but has a percentage of bismuth in it, which
reduces the melting point of the alloy to around 60 degees.

The upshot of this is that you introduce this allow to your joints, on
say a 44 lead TQFP for example, make sure that they have all been
covered - some flux helps. The alloy stays molten for a good few
seconds. In my experience it stays molten long enough for the soldering
iron to be put down and the tewwzers to be picked up before it sets.

Both parts can be recovered using some solder wick afterwards, to remove
the excess alloy, and a bit of cleaner to remove the flux.

Regards, Kevin

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