There are a variety of methods for fluxless soldering. The most common is
the use of a reducing atmosphere like hydrogen or formic acid. More common
for specialized applications, hybrids, etc., than for common mixed
technology or SMT PWBAs.
Regards,
Brad Vanderhoof
-----Original Message-----
From: Matthew Park [mailto:[log in to unmask]]
Sent: Wednesday, March 10, 1999 10:09 AM
To: [log in to unmask]
Subject: Re: [TN] Fluxless Soldering
Richard,
This time, I guess, your design engineering manager is right. There is a
fluxless soldering process available. If I remember correctly, one process I
am aware is called *PADS* (Plasma Assisted Dry Soldering???). Wow... a
fancy jargon isn*t it? In this process, components or assembled boards are
exposed in a PADS treatment within a vacuum chamber. This treatment turns
soldering surface to oxide-resistant by modifying soldering surface layer.
From there, you can store components or assembled boards for a specified
period prior to wavesoldering, reflow or handsoldering. You don*t need to
apply flux to allow wetting, thus no cleaning is required.
This process is ok for a lab application or a small production run. I don*t
have the info handy, but I am sure I have it filed away in my filing
cabinets. I can dig out something for you if you need to look further.
Regards
Matthew
Norsat International Inc.
>>> Richard Hamilton <[log in to unmask]> March 10, 1999 8:46 am >>>
Hello fellow TechNetters,
Well, we were asked a question by the design engineering manager yesterday
if we had considered a fluxless soldering process. We are aware of a process
called Solid Solder Deposit (SSD), but not a fluxless process by name.
After the manager read us the email he got from one of the marketing types,
I tend to believe that he was referring to no-clean process because of a
reference in his note about cleaning boards at a previous manufacturer (TI).
My guess (oh how I hate to guess/assume) is that this marketing type has
just mixed up a couple of buzz-words together,.....kinda like 'military
intelligence'. I mean look at it, 'no-clean flux', I can see how a sales
person would want to shorten that to 'no-flux'. Now as usual, it is up to us
manufacturing people to invent the process that has been sold to the
customer!!
And as a side note: Steve -
Your comments on machine maintenance are RIGHT ON!! You couldn't be more
correct. Sometimes I cringe at the way some machines are treated, and the
surprise that goes on when it does drop out!
Thanks all.
Richard Hamilton
Clemar Mfg. / Rain Bird
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