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Me too! And it's prep, prep and prep!"Watson A.Name "Watt Sun - the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:c375r4$6blpb$3@hades.csu.net...
I soldered a wire onto a battery once. It caused the internal battery
contact to become intermittent. I'll _never_ do that again.
I've soldered more than 100 cells and never had a problem.
Finish this phrase: "Russian ________"In article <9DI5c.37489$Z67.2075763@phobos.telenet-ops.be>,
"CWatters" <colin.watters@pandoraBOX.be> wrote:
"Watson A.Name "Watt Sun - the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:c375r4$6blpb$3@hades.csu.net...
I soldered a wire onto a battery once. It caused the internal battery
contact to become intermittent. I'll _never_ do that again.
I've soldered more than 100 cells and never had a problem.
Me too! And it's prep, prep and prep!
Can you be just a wee bit more specific. Google for "microwave ovenMikeM wrote:
Anybody build a welder capable of spot welding
tabs on batteries?
I came into a bunch of tabless NiCads, and would like to
attach tabs.
MikeM
Google for microwave oven welder and you will come up with a homemade
spot welder that can weld even thicker metal than NiCad battery tabs.
They are nickel. Reuse the old ones.MikeM <joe@yahoo.com> wrote:
Anybody build a welder capable of spot welding
tabs on batteries?
sorry, no. But another question:
Anybody who knows the material of these tabs?
Doesn't seem to be copper...
If it's a choice between soldering the cell or throwingI just solder directly to the battery, I tin it first, then solder either
a tab (ie:
keystone makes all sorts of PCB mount tabs), but this all depends on how
many you need to
make.
http://www.dvanhorn.org/NIMH/Index.php
This is a very bad idea, though I know people do it all the time.
The cell makers cringe when they hear stuff like this.
I had no problem:Watson A.Name \"Watt Sun - the Dark Remover\" wrote:
MikeM wrote:
Anybody build a welder capable of spot welding
tabs on batteries?
I came into a bunch of tabless NiCads, and would like to
attach tabs.
MikeM
Google for microwave oven welder and you will come up with a homemade
spot welder that can weld even thicker metal than NiCad battery tabs.
Can you be just a wee bit more specific. Google for "microwave oven
welder" got one hit to a dead site. Without the quotes got 4620 hits
to all sorts of stuff. To which were you refering?
Thanks, mike
--
Return address is VALID.
Bunch of stuff For Sale and Wanted at the link below.
Toshiba & Compaq LiIon Batteries, Test Equipment
Honda CB-125S $800 in PDX
Yaesu FTV901R Transverter, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/
I rejected it cause it didn't seem to meet the original statement thatmike wrote:
Watson A.Name \"Watt Sun - the Dark Remover\" wrote:
MikeM wrote:
Anybody build a welder capable of spot welding
tabs on batteries?
I came into a bunch of tabless NiCads, and would like to
attach tabs.
MikeM
Google for microwave oven welder and you will come up with a homemade
spot welder that can weld even thicker metal than NiCad battery tabs.
Can you be just a wee bit more specific. Google for "microwave oven
welder" got one hit to a dead site. Without the quotes got 4620 hits
to all sorts of stuff. To which were you refering?
Thanks, mike
I had no problem:
http://www.rhunt.f9.co.uk/Electronics/Spot_Welder/Spot_Welder_Page1.htm
Assuming that's the one.
Under the heading, "Sounded like a good idea at the time"Dave VanHorn wrote:
I just solder directly to the battery, I tin it first, then solder either
a tab (ie:
keystone makes all sorts of PCB mount tabs), but this all depends on how
many you need to
make.
http://www.dvanhorn.org/NIMH/Index.php
This is a very bad idea, though I know people do it all the time.
The cell makers cringe when they hear stuff like this.
If it's a choice between soldering the cell or throwing
it away, the "very bad idea" becomes a very good idea.
That doesn't change the fact that you can harm the cell
by soldering, but soldering a single cell into a 35
dollar pack is worth the chance to save the pack.
My brother-inlaw used oxygen to spray paint when his compressor died in the"Al" <no.spam@here.com> wrote in message
news:no.spam-8189C9.16483616032004@news.verizon.net...
In article <9DI5c.37489$Z67.2075763@phobos.telenet-ops.be>,
"CWatters" <colin.watters@pandoraBOX.be> wrote:
"Watson A.Name "Watt Sun - the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:c375r4$6blpb$3@hades.csu.net...
I soldered a wire onto a battery once. It caused the internal
battery
contact to become intermittent. I'll _never_ do that again.
I've soldered more than 100 cells and never had a problem.
Me too! And it's prep, prep and prep!
Finish this phrase: "Russian ________"
"Dave VanHorn" <dvanhorn@cedar.net> wrote in message
news:MMqdnQaNvIxR6srdRVn_iw@comcast.com...
"Al" <no.spam@here.com> wrote in message
news:no.spam-8189C9.16483616032004@news.verizon.net...
In article <9DI5c.37489$Z67.2075763@phobos.telenet-ops.be>,
"CWatters" <colin.watters@pandoraBOX.be> wrote:
"Watson A.Name "Watt Sun - the Dark Remover""
NOSPAM@dslextreme.com
wrote
in message news:c375r4$6blpb$3@hades.csu.net...
I soldered a wire onto a battery once. It caused the internal
battery
contact to become intermittent. I'll _never_ do that again.
I've soldered more than 100 cells and never had a problem.
Me too! And it's prep, prep and prep!
Finish this phrase: "Russian ________"
My brother-inlaw used oxygen to spray paint when his compressor died in
the
middle of a job, some people are just very lucky ( laquer based car paint
too)
Pat
One teeny little static discharge and !!!BOOM!!!
You may need to slow that discharge down a bit.Our capacitor bank is 1300uF of 200V SMPSU caps, which make "satisfying"
holes in screwdrivers when charged, but, thus far, no welding action. :-(
of leakage inductance did that ?You may need to slow that discharge down a bit.
An inductor would be a relatively low loss way to rectangularize the pulse.
Thanks Dave, but I rather thought that the several hundred millihenrys
Why not apply the bank more or less directly to the job, perhaps at aThis has been a very fortuitous thread, but hasn't helped a lot yet. I
am ALSO trying to spot weld, but I am trying to spot pure molybdenum
sheet, 0.2mm thick, to itself. Capacitor discharge seemed like the way
to go, but the top-of-the-head answers like "discharge a capacitor
bank into a microwave oven transformer" seem to ignore the leakage
inductance being monumental.
Our capacitor bank is 1300uF of 200V SMPSU caps, which make
"satisfying" holes in screwdrivers when charged, but, thus far, no
welding action. :-(
I must have missed that. Where did you have the inductor? What's it'sDave VanHorn wrote:
You may need to slow that discharge down a bit.
An inductor would be a relatively low loss way to rectangularize the
pulse.
Thanks Dave, but I rather thought that the several hundred millihenrys
of leakage inductance did that ?
Shorting a cap with a screwdriver creates an arc that vaporizes some of it, butS.M.Taylor wrote:
This has been a very fortuitous thread, but hasn't helped a lot yet. I
am ALSO trying to spot weld, but I am trying to spot pure molybdenum
sheet, 0.2mm thick, to itself. Capacitor discharge seemed like the way
to go, but the top-of-the-head answers like "discharge a capacitor
bank into a microwave oven transformer" seem to ignore the leakage
inductance being monumental.
Our capacitor bank is 1300uF of 200V SMPSU caps, which make
"satisfying" holes in screwdrivers when charged, but, thus far, no
welding action. :-(
Why not apply the bank more or less directly to the job, perhaps at a
much lower voltage?
I "imagined" that what others have commented on about using a microwaveShorting a cap with a screwdriver creates an arc that vaporizes some of it, but
what's needed here is to get the energy into the metals (MUCH more current, MUCH
less voltage). And even if you could find a multi-Farad cap, how would you
switch it? Like other posters, I would imagine that switching the HV caps into
the uwave xfmr primary should be workable (with a HV thyristor?). The
capacitance resonates with the transformer's leakage inductance (mainly), but
it's damped by the winding and load resistances.
You need to try VERY hard to minimize leakage inductance in yourThis has been a very fortuitous thread, but hasn't helped a lot yet. I
am ALSO trying to spot weld, but I am trying to spot pure molybdenum
sheet, 0.2mm thick, to itself. Capacitor discharge seemed like the way
to go, but the top-of-the-head answers like "discharge a capacitor bank
into a microwave oven transformer" seem to ignore the leakage inductance
being monumental.
Our capacitor bank is 1300uF of 200V SMPSU caps, which make "satisfying"
holes in screwdrivers when charged, but, thus far, no welding action. :-(
ARE there are properly worked details for pulse discharge welders
anywhere ?
Thanks
Steve
That's rather the conclusion I had come to as well !You need to try VERY hard to minimize leakage inductance in your
transformer. There are also satuation issues. A microwave oven
transformer is designed specifically for LOTS of leakage inductance,
then they put shunts in to make it higher still. Not a good starting
point for a CD welder. But makes an OK brute force 60 Hz. welder.
Our head is an opposed pincer type thing, arranged a bit like a toggleIf you're doing serious welding, you need to make me an offer
on my small welding head. It's a Unitek model 32.
A good repeatable welding head is half the battle.