Carol, your lead-free component leads are likely 100% tin.  They will
solder just fine in the leaded wave!  (Reserve your lead-free wave for
true lead-free assemblies).  That thin tin coating on the leads of the
components will completely dissolve into the tin/lead solder in less
than 1/10 of second.  Besides, your tin/lead solder pot is set to 260C?
And you lead-free solder pot is set to what?  260C as well?

Ryan

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Carol Spiers
Sent: Monday, December 06, 2004 3:14 PM
To: [log in to unmask]
Subject: [LF] Transition questions, Pb to Pbfree wave soldering ??


Theoretically I have 80% of my parts now sourced as Pbfree.  Now I have
a dilemma.  I have two automated wave solder machines.  One machine is
dedicated to leaded products and now a new one complete withnitrogen
blanket and Pbfree high temp resistant fingers and solder pot.  I am
concerned about not having reliable joints on my lead-free parts if I
run them through the tin/lead  wave solder due to the possibility that
the  lower processing  temperature may  not meld the parts with the
board surface. 
On the other hand I am very concerned about contaminating my new (and
expensive) Pbfree wave solder with lead dissipated from the 20% of
components that still have lead on their leads. 
I can get the bare boards in either HASL or silver emersion.  
These are double sided, combined  smt and thru hole boards, with thru
hole on the top side only, smt both top and bottom.  
I would appreciate some advise from the experts out there as to which
scenario I should opt for and why.  
Everyone's opinion is welcome

Thank you 

C. M. (Carol) Spiers
Director of Operations 
Interalia Inc. 

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