H
haleem
- Jan 1, 1970
- 0
i have a question, why copper is used in stripboard instead of othe
elements
thanx :
elements
thanx :
i have a question, why copper is used in stripboard instead of other
elements?
thanx
i have a question, why copper is used in stripboard instead of other
elements?
thanx
Ross Herbert said:On Wed, 30 Mar 2005 01:07:25 -0600,
If you need to ask this question then I don't see a future for you in
electronics. Have you ever thought of doing some basic research on the
web, or even reading a few books from your library?
mc said:Well... Gold and silver might be a bit better, but too expensive. You will
occasionally see copper with gold, silver, or tin plating on it. Tin
enhances solderability but by itself melts at too low a temperature.
Aluminum is a good conductor but not solderable.
More importantly, aluminum
forms an *invisible* nonconductive coating as it oxidizes in air.
With
copper, you can see the tarnishing happen, which is much better; you know
whether it's clean or not.
Iron and steel are harder to solder than copper.
mc said:Is this forum only for questions that cannot be answered by library
research? I've been using it sporadically for about a decade and never knew
of that restriction.
If you don't want to answer a basic question, you don't have to.
Again, it depends. On how thick the metal is, what lind of flux is
used, and of course, the solder, etc. Remember that the usual soldering
process is optimized for copper, so using it on a different metal may
not give as good a result.
jim said:and iron and steel are soldered all the time, in industry, in home shops,
no big problem, but it's called brazing, cause brass is used as the solder
i guess. the temps are quite high, so it's not really applicable to
electronics, but i suppose industrial cabling could use it.
I ran into a problem where someone tried to fix a leak in t water
cooled TV transmitter by braising the brass fittings to the 2" copper
pipe. It was a real pain in the ass to salvage the brass fittings which
were long out of production. I had to cut the pipe off flush, then
carefully file away the braised areas before I could heat everything and
pry out the copper stubs. The brass parts were used to split the water
flow for different tubes and had been custom cast in the early '50s
jim dorey said:and iron and steel are soldered all the time, in industry, in home shops,
no big problem, but it's called brazing, cause brass is used as the solder
i guess. the temps are quite high, so it's not really applicable to
electronics, but i suppose industrial cabling could use it.
Spehro said:Brazing is done with "hard" (silver) solder. It doesn't seem to have
anything to do directly with brass- the other meaning of "braze"
(decorate, make of, or make hard like brass) came from a different
word (OE "braes") according to AH4.
BTW, "braising" is a cooking term- browning in fat, then simmering in
a bit of liquid. The root (OF "brese") is thought to be the same for
the two words.
Sounds like a real PITA to salvage the manifold. I imagine it would be
easy to have small leaks if you were not very careful.
Best regards,
Spehro Pefhany
Brazing isn't soldering because it doesn't use solder.
jim dorey said:i believe that even if it doesn't contain lead it can be called solder,
far as i know it refers to any non-fusion weld involving metal as a glue.
or are you refering to another reason it's not soldering?
Actually, 'brazing', did originally use brass, and still does for manySpehro Pefhany said:Brazing is done with "hard" (silver) solder. It doesn't seem to have
anything to do directly with brass- the other meaning of "braze"
(decorate, make of, or make hard like brass) came from a different
word (OE "braes") according to AH4.
BTW, "braising" is a cooking term- browning in fat, then simmering in
a bit of liquid. The root (OF "brese") is thought to be the same for
the two words.
Sounds like a real PITA to salvage the manifold. I imagine it would be
easy to have small leaks if you were not very careful.
Watt said:So the guy had a firebrick mold
that he clamped around the two
conductors. He filled it with a
thermite compound that had a lot of
copper in it.
i believe that even if it doesn't contain lead it can be called solder,
far as i know it refers to any non-fusion weld involving metal as a glue.
or are you refering to another reason it's not soldering?
http://www.google.com/search?hl=en&lr=&oi=defmore&q=define:brazing
Looks like the consensus is that brazing is higher temp than soldering.
Watson said:Change that to solderable with difficulty. There are fluxes such as
fluoride fluxes that will make soldering to aluminum easy. I soldered a
piece of aluminum by sanding it and covering it with a layer of greasy
flux to prevent it from oxidizing. Then with a soldering iron that puts
out a lot of heat, the solder wets the aluminum like other metals.
If that were true, you could not test for conductivity with a DMM for
example. The layer is so thin that it poses little barrier to
electricity. As far as invisible, well, if the aluminum has been
exposed to air then it is a given that it has the oxide layer.