>
>Hi Jeff,
>
>We are currently using nitrogen wave soldering process and reflow process.
>What I experience is that I don't see any difference when having N2 ruuning 
>on the reflow process. We only use N2 if the paste (low-residue) requires it.
>
>However, as for wave-soldering process, we have a full tunnel system.
>If the N2 level is propably controlled, you should be able to get a very 
>good solder-filling and good topside solder formation generally across the 
>board. 
>One can see that it happens when board passes thru' the first wave. 
>We used to face is tiny solder balls/solder dust on top of the PCB's surface,
>and one need to control the wave-level properly and carefully. However,
>if the board is having blow-hole issue, there will even more solder dusts fall
>onto the board's surface.
>If there is a design issue, having N2 in your wave will not resolve it. 
>
>I am presently evaluating some no-clean fluxes that doesn't require N2 on
>the conventional machice. 
>I have found a couple of them seem to perform very well and it gives a  
>clean and clear surface, as what I get out from the N2 wave-solder process. 
>
>Good Luck.
>
>Poh   Kong-Hui
>Nera Electronics
>Email: [log in to unmask]
>Fax: (65) 7765492
>
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> 
>
>At 12:03 PM 6/18/96 -0400, you wrote:
>>Greetings!
>>
>>I am hoping to get some feedback regarding the following issue:
>>
>>We are looking at Nitrogen to see if it would provide payback in
>>the following three areas:  1) Improve solder quality on
>>conventional SMT,  2) Improve solder quality on fine pitch SMT,
>>and 3) allow us to use low-residue flux which may remove the
>>need for the wash so we can machine-place certain parts  that
>>cannot go through the wash process. 
>>
>>Understanding that Nitrogen use is fairly common in the
>>electronics industry, we are trying to determine if it makes
>>economic and strategic sense for us as a company. 
>>
>>Any feedback/input/experiences welcome.
>>
>>Thank you,
>>
>>Jeff Nelson
>>Current Electronics, Inc.
>>(503)538-0626
>>[log in to unmask]
>>
>>
>