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Posted by Jimmie D on June 9, 2007, 3:17 pm
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I have a huge bridge rectifier I would like to use to convert an AC stick
welder to DC. It is as simple as just connecting the rectifier to the welder
or will I need something else like some sort of filtering.
Jimmie
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Posted by Martin H. Eastburn on June 9, 2007, 11:16 pm
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No real filtering but many have a high current coil (RF) in series
and an arc-over plate set to help develop an arc. Not required
and can be hard on the bridge by to high a voltage generated.
Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot"s Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/
Jimmie D wrote:
> I have a huge bridge rectifier I would like to use to convert an AC stick
> welder to DC. It is as simple as just connecting the rectifier to the welder
> or will I need something else like some sort of filtering.
>
> Jimmie
>
>
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Posted by Too_Many_Tools on June 10, 2007, 2:21 am
Please log in for more thread options wrote:
> No real filtering but many have a high current coil (RF) in series
> and an arc-over plate set to help develop an arc. Not required
> and can be hard on the bridge by to high a voltage generated.
>
> Martin
> Martin H. Eastburn
> @ home at Lions' Lair with our computer lionslair at consolidated dot net
> TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot"s Medal.
> NRA Second Amendment Task Force Charter Founder
> IHMSA and NRA Metallic Silhouette maker & member.http://lufkinced.com/
>
> Jimmie D wrote:
> > I have a huge bridge rectifier I would like to use to convert an AC stick
> > welder to DC. It is as simple as just connecting the rectifier to the welder
> > or will I need something else like some sort of filtering.
>
> > Jimmie
>
> ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet
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> No real filtering but many have a high current coil (RF) in series
> and an arc-over plate set to help develop an arc. Not required
> and can be hard on the bridge by to high a voltage generated.
>
What's an arc-over plate?
TMT
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Posted by Martin H. Eastburn on June 10, 2007, 11:02 pm
Please log in for more thread options I was too sleepy!
The arc plate is between the input of the coil (coil continues on to
output. It is so when a high voltage Oscillation of you trying to start
current - it flies back in a sense and generates high voltage that then
keeps the arc going to start high current. The voltage generated can
be high -
so - now to the point - two sharp edges backed away from each other -
guess - now maybe 1/8" don't have arc breakdown of air at all humid
conditions... the arc points breakdown the HV and limit it to that
value. It is a voltage regulator.
Very high voltage ones I have used in life (still alive) - were large
spheres of plated copper that were hand cranked (life and death
machine!) until the arc distance is set to xx mm and then that set
the operating voltage. (The capacitors were in oil baths!) The big
black switch was thrown and blue-white arc danced until we turned
it off. With gloves and with hope and faith we would turn up/down
the high voltage.
The LC circuit that generates is typically an L filter looking.
See if you can find some TIG designs as they have them also.
Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot"s Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/
Too_Many_Tools wrote:
> wrote:
>> No real filtering but many have a high current coil (RF) in series
>> and an arc-over plate set to help develop an arc. Not required
>> and can be hard on the bridge by to high a voltage generated.
>>
>> Martin
>> Martin H. Eastburn
>> @ home at Lions' Lair with our computer lionslair at consolidated dot net
>> TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot"s Medal.
>> NRA Second Amendment Task Force Charter Founder
>> IHMSA and NRA Metallic Silhouette maker & member.http://lufkinced.com/
>>
>> Jimmie D wrote:
>>> I have a huge bridge rectifier I would like to use to convert an AC stick
>>> welder to DC. It is as simple as just connecting the rectifier to the welder
>>> or will I need something else like some sort of filtering.
>>> Jimmie
>> ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet
News==----http://www.newsfeeds.comThe #1 Newsgroup Service in the World!
120,000+ Newsgroups
>> ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
>
>> No real filtering but many have a high current coil (RF) in series
>> and an arc-over plate set to help develop an arc. Not required
>> and can be hard on the bridge by to high a voltage generated.
>>
>
> What's an arc-over plate?
>
> TMT
>
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Posted by awright on June 10, 2007, 3:48 am
Please log in for more thread options > I have a huge bridge rectifier I would like to use to convert an AC stick
> welder to DC. It is as simple as just connecting the rectifier to the welder
> or will I need something else like some sort of filtering.
>
> Jimmie
Do you have any part numbers or specs on the diodes? How do the specs
compare with the peak voltage and current from the welder? Lots of
voltage headroom is probably a good idea due to voltage transients.
Probably also a good idea to actually measure the peak current that
your welder can put out into a short circuit and be sure the diodes
can handle that with ease.
An arc stabilizer coil is beneficial on the output of the bridge.
Also, while I do not know, I suspect a modest value capacitor across
the bridge output would, in combination with the coil, provide a
filter to help block HF or voltage spikes from getting back to the
diodes from the welding leads. It can be a low value like 0.1
microfarad at a few hundred volts since it only has to be effective at
high frequencies.
awright
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> welder to DC. It is as simple as just connecting the rectifier to the welder
> or will I need something else like some sort of filtering.
>
> Jimmie
>
>