I work in electronics manufacturing. Lead free solder for surface mount devices
has been commonplace for more than 20 years.It's stable and proven technology.
Higher solder temperatures are correct but nothing more than a different
process variable. 73,Gary K9GS
-------- Original message --------From: Ken Winterling <wa2lbi@gmail.com> Date:
3/4/20 6:17 PM (GMT-06:00) To: KD7JYK DM09 <kd7jyk@earthlink.net> Cc: Rfi
List <rfi@contesting.com> Subject: Re: [RFI] LED streetlights - Lumenistics I
believe you can thank lead-free solder for many failed joints. It needshigher
heat to melt than the leaded type. I’ve been working on equipmentfor over
fifty years and see more PCB solder joint failures in the recentdecades than
when I was much younger.KenWA2LBIOn Wed, Mar 4, 2020 at 18:20 KD7JYK DM09
<kd7jyk@earthlink.net> wrote:> "I remember years ago when municipalities
replaced incandescent traffic> lights with LED lights to save money. They
discovered that in winter the> snow would cover and block the lights since they
didn’t generate heat> like their predecessors.">> Another issue, both with LED
traffic signals, and automotive lights,> which personally bugs the crap out of
me, is the hot/cold of just the> weather alone causes the solder joints to fail
quickly, and I see lamps> with various blocks, chunks, stripes, et cetera where
a section no> longer illuminates.>> One would have imagined this to be resolved
in initial testing, but I> still see it on a daily basis, after, what, some
thirty years of> technology evolution?>> Kurt> --KenWA2LBISent from one of my
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