I would expect problems reflowing in and old vertical HASL machine:

 Oil reflow is generally done by heating the board in two steps to   
prevent thermal shock,
warping and delamination.  Using the HASL to do the dipping only allows   
one oil tank.

 One reason for plated/fused solder is the solder thickness is often   
specified to be
 thicker than that obtainable by HASL.  To keep the solder from sagging   
the panel
must be horizontal.

If you use the air to blow off excess solder expect dewetting problems   
due to the intermetallic
formed between the plated solder and the copper.

 ----------
From:  Eltek Ltd. - Process   
Engineering[SMTP:[log in to unmask]]
Sent:  Monday, December 09, 1996 7:00 AM
To:  [log in to unmask]
Subject:  Fab/HO Reflow

Hello there !
We have strange idea to perform vertical Hot Oil Reflow . We have an old   
,
vertical HAL . The idea is to fill it with oil,heat up to 210-230   
centigrade
and to perform reflow with or without air blow. Does anyone tried it ?
Szpruch Edward
Eltek
Tel 97239395050
Fax 97239309581
E-mail [log in to unmask]

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