Author Topic: DIY MMA welder (aka stick welder)  (Read 86 times)

Offline rikkitikkitavi

  • High Voltage Enthusiast
  • *
  • Posts: 11
    • View Profile
DIY MMA welder (aka stick welder)
« on: July 11, 2018, 04:08:30 PM »
I have a couple of huge transformers (2kVA 20*2V) -C-core that is.

but it is the normal type, ie not possible to install magnetic shunts. I have  some large inductors (reactors)
I have humungs large rectifiers (400V 200A *16pcs) and heatsinks to match. Might even have some thyristors fitted for this...

A simple setup would be to use it as a current limited output for a MMA (stick) welder, AC or DC.

But it is difficult to adjust the output current this way.

 Also, the circuit needs to be designed with quite a large inductance in the reactor to compensate for the large open circuit voltage used for arc striking (about 50V+) compared to operating voltage on arc (about 15-25V)

One option is to use one of my even humungouser variacs (25A, ie 5kVA) to adjust output voltage and hence current draw as the welding arc voltage is not so affected by current through it.
This leads however to a less than mobile equipment. All together it packs up to 60 kg+ without casing. Or weelbarrow...

I never intended to have a inverter style portable welder but what options are there to replace the variac? How to build a variable  inductance for current limit easy way?
I have also some iron cores EI-150 size etc, and a good set of angle grinders :)

What ideas to use for increasing the voltage for arc striking but still having a low voltage output?


A man can not have to many variacs

Offline oneKone

  • High Voltage Engineer
  • ****
  • Posts: 212
    • View Profile
Re: DIY MMA welder (aka stick welder)
« Reply #1 on: July 14, 2018, 05:54:41 AM »
Sounds like an awesome project. I'm not big into welding but one thing you can try to get a higher start voltage is to have a HF start box. This would allow a few kv to jump from the stick to the work surface to get an easier start, similar to the way a tig welder initiates the arc.

A quick google search has found this:
 https://www.dudley.nu/projects/hfstart/

i had to repair the hf start in my tig welder and this is what i replaced the step-up transformer and circuitry with:
 https://www.ebay.com.au/itm/Boost-Step-up-Module-High-voltage-Generator-Converter-DC3-7v-7-4v-to-400KV-EU/222903670891?hash=item33e618186b:g:H8kAAOSwXXVavZbv

Offline rikkitikkitavi

  • High Voltage Enthusiast
  • *
  • Posts: 11
    • View Profile
Re: DIY MMA welder (aka stick welder)
« Reply #2 on: July 16, 2018, 10:17:34 AM »
Hmm, good idea.

Using a high voltage design, low resistance reactor in series to block the voltage but the problem is that it needs to block only the HF .  This is how any normal TIG is used.
DC welding , typically electronic inverter to be able to control current properly and with inert electrodes and protection gas.

It can therefore only be used with DC, but fortunately most MMA welding is used with DC (AC demands AC welding pins) , either positive or negative to the work piece.

Will look into it further. The protection reactor might demand some design for high impendance and high voltage design at HF, but low impendance at DC.

 
 
A man can not have to many variacs

High Voltage Forum

Re: DIY MMA welder (aka stick welder)
« Reply #2 on: July 16, 2018, 10:17:34 AM »

 


* Recent Topics and Posts

post Re: QCW Parts
[Sell / Buy / Trade]
alan sailer
Today at 01:21:28 AM
post BNC connector repair on (epoxy potted) Pearson Wideband Current Monitor
[Electronic circuits]
Hydron
July 18, 2018, 03:55:09 PM
post Re: How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
Uspring
July 18, 2018, 03:20:07 PM
post Re: QCW Parts
[Sell / Buy / Trade]
TDAF
July 18, 2018, 09:58:27 AM
post Re: Big filter caps obtainability
[Dual Resonant Solid State Tesla coils]
DaiKen
July 18, 2018, 08:22:21 AM
post Re: QCW Parts
[Sell / Buy / Trade]
alan sailer
July 18, 2018, 04:02:37 AM
post Re: QCW Parts
[Sell / Buy / Trade]
oneKone
July 18, 2018, 12:56:29 AM
post Re: How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
oneKone
July 18, 2018, 12:54:30 AM
post Large Ferrite Core with IGBT-Brick Driver
[Transformer (ferrite core)]
Phoenix
July 17, 2018, 07:19:13 PM
post QCW Parts
[Sell / Buy / Trade]
alan sailer
July 17, 2018, 07:00:59 PM
post Re: How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
alan sailer
July 17, 2018, 05:51:35 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
July 17, 2018, 07:36:39 AM
post Re: Big filter caps obtainability
[Dual Resonant Solid State Tesla coils]
oneKone
July 17, 2018, 04:18:06 AM
post Re: Micro drsstc
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 16, 2018, 08:19:13 PM
post Re: How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
Mads Barnkob
July 16, 2018, 08:12:20 PM
post Re: Big filter caps obtainability
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 16, 2018, 07:47:25 PM
post Re: How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
moisesdias
July 16, 2018, 12:37:20 PM
post Re: DIY MMA welder (aka stick welder)
[Transformer (iron core)]
rikkitikkitavi
July 16, 2018, 10:17:34 AM
post Re: How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
oneKone
July 16, 2018, 06:47:27 AM
post How exactly Antenna or Feedback Core works?
[Solid state Tesla coils]
moisesdias
July 16, 2018, 04:16:00 AM
post Re: Big filter caps obtainability
[Dual Resonant Solid State Tesla coils]
DaiKen
July 14, 2018, 01:30:26 PM
post Re: DIY MMA welder (aka stick welder)
[Transformer (iron core)]
oneKone
July 14, 2018, 05:54:41 AM
post Re: Micro drsstc
[Dual Resonant Solid State Tesla coils]
oneKone
July 14, 2018, 04:18:17 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
July 14, 2018, 04:00:09 AM
post Re: DRSSTC impedance
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 13, 2018, 09:00:52 PM
post Re: DRSSTC impedance
[Dual Resonant Solid State Tesla coils]
Marty
July 13, 2018, 12:45:17 PM
post Re: DRSSTC impedance
[Dual Resonant Solid State Tesla coils]
Hydron
July 13, 2018, 09:08:00 AM
post Re: DRSSTC impedance
[Dual Resonant Solid State Tesla coils]
Teravolt
July 13, 2018, 03:22:21 AM
post DRSSTC impedance
[Dual Resonant Solid State Tesla coils]
Marty
July 12, 2018, 08:14:38 PM
post Re: Huawei RRU3908 base station teardown and circuit analysis (part 1 & 2)
[Radio frequency]
Mads Barnkob
July 12, 2018, 07:55:47 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Usernametaken
July 12, 2018, 10:14:41 AM
post DIY MMA welder (aka stick welder)
[Transformer (iron core)]
rikkitikkitavi
July 11, 2018, 04:08:30 PM
post Absorption plate set for gamma radiation
[Detection, counting and measurements]
Physikfan
July 10, 2018, 12:50:46 PM
post Re: Huawei RRU3908 base station teardown and circuit analysis (part 1 & 2)
[Radio frequency]
Mads Barnkob
July 09, 2018, 09:46:10 PM
post Re: Problem with LOPT
[Transformer (ferrite core)]
Andy Kay
July 09, 2018, 08:54:25 AM
post Re: Problem with LOPT
[Transformer (ferrite core)]
profdc9
July 09, 2018, 05:08:15 AM
post Re: looking for PCB creating software
[Printed Circuit Board]
Teravolt
July 08, 2018, 06:57:35 PM
post Re: Problem with LOPT
[Transformer (ferrite core)]
Andy Kay
July 08, 2018, 05:39:19 PM
post Re: More Tesla Coil Music
[Dual Resonant Solid State Tesla coils]
profdc9
July 08, 2018, 03:58:55 PM
post Re: Problem with LOPT
[Transformer (ferrite core)]
profdc9
July 08, 2018, 03:48:15 PM
post Re: Problem with LOPT
[Transformer (ferrite core)]
Andy Kay
July 08, 2018, 12:03:23 PM
post Re: More Tesla Coil Music
[Dual Resonant Solid State Tesla coils]
Hydron
July 08, 2018, 11:55:56 AM
post Re: More Tesla Coil Music
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 08, 2018, 11:09:42 AM
post Re: Problem with LOPT
[Transformer (ferrite core)]
profdc9
July 08, 2018, 03:26:32 AM
post More Tesla Coil Music
[Dual Resonant Solid State Tesla coils]
profdc9
July 08, 2018, 03:15:36 AM
post Problem with LOPT
[Transformer (ferrite core)]
Andy Kay
July 07, 2018, 08:37:42 PM
post Re: looking for PCB creating software
[Printed Circuit Board]
flyrod
July 07, 2018, 06:00:01 AM
post Wheatstone bridge and ADC reference voltage
[Electronic circuits]
kamelryttarn
July 06, 2018, 09:56:20 AM
post Re: looking for PCB creating software
[Printed Circuit Board]
Teravolt
July 06, 2018, 06:13:33 AM
post Coils in close proximity
[Vacuum tube Tesla coils]
pentode
July 05, 2018, 05:18:10 PM