Joe,
I am the wavesolder product specialist for speedline Electrovert and have been
working with the Hot Air Knife for several years now. The knife does not
normally cause solder balls or splashing unless it was not correctly set up and
blowing solder out of the holes. The Hot Air Knife is a great tool to overcome
design and layout shortcomings but as with any tool the user must have a
knowledge of how to set it up to optimize the process. The knife can debridge
connectors, soic's, flatpaks and a host of other areas that might bridge. If
you do decide to use the air knife in your process I can also provide you with a
copy of a Guide to Wavesoldering and Hot Air Knife Processing.
Regards,
Ken KIrby
---------------------- Forwarded by Kenneth Kirby/ElectrovertUS/Cookson on
04/20/99 10:19 AM ---------------------------
(Embedded
image moved "Kane Joseph" <[log in to unmask]>
to file: 04/19/99 05:24 PM
pic32166.pcx)
To: [log in to unmask]
cc: (bcc: Kenneth Kirby/ElectrovertUS/Cookson)
Subject: [TN] Hot Air Knife
TN'ers:
We're getting a handful of bridges at wave solder on a few designs. We've
tried A, B, and C, but they continue to show up consistently on some styles
of connector behind chip components, and on trailing leads of flatpacks.
The machines is a fairly new Electrovert with convection preheat, Lambda
wave, and chip wave. We're using Sn63 at 500F with RMA 25%.
We're looking at a hot air knife retrofit, which would be turned off on
everything but problem boards. We've had a demo, with mixed results. Good:
bridges were much improved, and no insufficients. Not-So: some frosty
looking joints, which we expected, but also a lot of solder balls and
splashes.
We've heard that setup can be touchy, and we didn't expect to optimize on a
two board sample, but we're not sure what we can conclude here.
Unfortunately, the demo was not apples-to-apples - it was performed on an
inerted machine with an A-type wave, and we're not sure if the splashing and
balls could be attributable to the increased surface tension.
Anyone out there have good things to say about their hot air knife?
Joe Kane
Lockheed Martin Control Systems
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