Hi all,
In a previous incarnation, I used and researched the vapor phase process. Yes, there are still companies marketing vp equipment and fluids. Where I worked, we needed a stable reflow medium that gave our boards ultimate heat transfer across the board. Vapor phase gave us this. The deltas measured were shockingly tight as compared to Convection reflow. I was truly amazed at the results we saw. (Larry Tawyea can back me up on this). Also, yes, the fluids are amazingly expensive. At around $1000.00 a gallon, that is pricy. 3M makes Fluorinert, I believe. Also, Galden makes some. There are more, but I can't remember. I remember hearing that Fluorinert is approved as a blood substitute for open-heart surgeries, that's kinda weird. All in all, with the high-temp, down-hole stuff we were building, the criticality of having ultimate thermal dispersion across the assy. was achieved with vapor phase. As for laser soldering, I've no experience. Hope this helps.
Jason Gregory
Software Specialist - NPI Group
SCI Systems/Plant 2
13000 S. Memorial Pkwy.
Huntsville, AL. 35803
(256) 882-4107 x3728
[log in to unmask]
>>> [log in to unmask] 06/27/01 09:28AM >>>
Werner brings up an interesting point. Does anyone have an opinion on the
trends in solder reflow in the contract assembly industry? Are we seeing a
resurgence in vapor phase? Has flowing nitrogen during infrared fallen to
the wayside? Interested in seeing your responses.
Best Regards,
Craig
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Werner Engelmaier
Sent: Thursday, May 31, 2001 1:19 PM
To: [log in to unmask]
Subject: Re: [TN] AW: [TN] Pad in Via for BGA's - Part II
Hi Rush,
Vapor phase soldering was and is thew most elegant engineering solution to
soldering--no over-temperatures, no profiles, absolute temperature
uniformity. What killed this approach in the past was inadequate
equipment--thhis is no loger a problem.
Werner Engelmaier
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