We have ran both the full tunnel (50 - 100 ppm oxygen) and have now gone to 
the Contour system (10 ppm oxygen at joint formation area)  by Electrovert. 
 No difference that I know of, in the test probe contact arena.  We are 
using a 1.5 % solids flux however, which sounds a little stronger then what 
you are using.  I don't think that you would need the whole tunnel but, some 
simple testing should give some answers.
 ----------
From: TechNet-request
To: TechNet
Subject: ASSY: BOUNDARY VS. FULL TUNNEL WAVE SOLDER NITROGEN INERTING
Date: Friday, August 16, 1996 11:19

DOES ANYONE HAVE EXPERIENCE IN COMPARING INERTING THE WAVE
SOLDERING OPERATION ONLY AT THE WAVE AS OPPOSED TO FULL
TUNNEL INERTING?

CAN YOU GO TO VERY LOW SOLIDS FLUXES (0.5-1.0%) WITH
BOUNDARY INERTING OR DO YOU NEED THE FULL TUNNEL?

IF YOU CAN GET BY WITH BOUNDARY INERTING:

1. CAN YOU GAIN A BENEFIT BY BEING ABLE TO USE  LESS
EXPENSIVE, LOW  FORCE PROBE, TEST FIXTURES?

2. CAN YOU DECREASE THE FALSE REJECTS IN TEST WHICH ARE DUE
TO FLUX RESIDUES?

VIC BELDAVS
(414) 362-2797
[log in to unmask]

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