Overvoltage protection

[josephkk]

Still needs full penetration through the tab, partial penetration into
the terminal.

Not exactly easy to control.

Easier than you might think. Non-engineer builders have made reliable
ones DIY. It is a variant of a spot welder.

?-)

 

[Piotrne]

Hi,

we have solved the problem of overvoltage in the welder.
There was a basic mistake in the circuit: a missing diode.

Here is the current version of the circuit:
http://piotrne.republika.pl/Spawarka3e.png
with the diode marked in red.

The diode turns on after turning off the transistor
and directs the current to the load.

So - initial attempts to absorb these overvoltage pulses
were wrong (they may have several kW!) They should be
directed to the load. Now, everything works as it should,
even with the ionizer.

Regards
P.

 

[josephkk]

Hi,

we have solved the problem of overvoltage in the welder.
There was a basic mistake in the circuit: a missing diode.

Here is the current version of the circuit:
http://piotrne.republika.pl/Spawarka3e.png
with the diode marked in red.

The diode turns on after turning off the transistor
and directs the current to the load.

So - initial attempts to absorb these overvoltage pulses
were wrong (they may have several kW!) They should be
directed to the load. Now, everything works as it should,
even with the ionizer.

Regards
P.

Huzzaa! Who would have thought it would be that easy?

?-))

 

[[email protected]]

Hi,



we have solved the problem of overvoltage in the welder.

There was a basic mistake in the circuit: a missing diode.



Here is the current version of the circuit:

http://piotrne.republika.pl/Spawarka3e.png

with the diode marked in red.



The diode turns on after turning off the transistor

and directs the current to the load.



So - initial attempts to absorb these overvoltage pulses

were wrong (they may have several kW!) They should be

directed to the load. Now, everything works as it should,

even with the ionizer.



Regards

P.

That should work just fine. There are gasless plasma welders using water now:
http://www.multiplaz.com/about -not cheap

 

[Piotrne]

bloggs writes:

That should work just fine. There are gasless plasma welders using water now:
http://www.multiplaz.com/about -not cheap

If our attempts to bring the device to work failed,
the next option was to buy a welder with a spot welding
function. For example, a Kemppi welder with the MicroTack
function. This could be even more expensive than this
plasma welder.

Hopefully our welder will work correctly. A few things have
to be done: synchronization with a stepper motor moving
the electrode, measurement of the current, shaping the
I(t) function.

Regards
PF