Hi Joe and Jack,

You peaked my interest enough to make a comment and ask a question...
I have been hearing rumblings in the industry about lead free soldering for
awhile now... and I understand that there are some obstacles to the process
that are undesirable at best. Pure tin welds for component mounting are more
than likely more brittle compared to tin/lead alloy welds. And the tin/lead
alloy melts at a much lower temp than tin by itself... This means exposing
the components to much higher temperatures in order to solder. Extreme temp
exposure is probably undesirable for a lot of reasons structurally and
electrically...
Is the only benefit environmental? Are we just trying to formulate 'lead
free' to avoid using lead because of its poisonous nature or is there some
other benefit from the process that escapes me? Gold uses cyanide in its
process.... should we be gold free too?


Bill Brooks
PCB Design Engineer , C.I.D.
DATRON WORLD COMMUNICATIONS, INC
3030 Enterprise Court
Vista, CA 92083
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
mailto:[log in to unmask]
IPC Designers Council, San Diego Chapter
http://www.ipc.org/SanDiego/
http://home.fda.net/bbrooks/pca/pca.htm


-----Original Message-----
From: Joseph Fjelstad [mailto:[log in to unmask]]
Sent: Thursday, January 10, 2002 3:33 PM
To: [log in to unmask]
Subject: Re: [TN] Lead Free Soldering


Hi Jack

What is the intent of this comment?

"Of course, subscribing to the IPC sponsored forum NoLeadTech is another way
to get answers. That forum is reserved for discussion of lead-free soldering
research and implementation issues. Another forum is leadfree but questions
about how to do something on that forum usually get more comments about why
you shouldn't be asking than answers to your questions."

It sounds rather disparaging.

Information about the problems of leadfree should not be swept under the
rug. Opposing information and views are not threats. Shutting down this site
is one way to end the discussion if that is what is sought.

Kind regards,
Joe

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