Author Topic: DIY MMA welder (aka stick welder)  (Read 455 times)

Offline rikkitikkitavi

  • High Voltage Enthusiast
  • *
  • Posts: 15
  • Karma: +1/-0
    • 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: 235
  • Karma: +3/-0
    • 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: 15
  • Karma: +1/-0
    • 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: WTS [EU]: UD2.7 thru hole pcb
[Sell / Buy / Trade]
FilipŠebík
Today at 08:39:46 AM
post Re: UD 2.7C Build
[Dual Resonant Solid State Tesla coils]
Thunderstruck
Today at 08:35:33 AM
post Re: Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
flyrod
Today at 04:07:24 AM
post Re: Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
Thunderstruck
March 23, 2019, 10:07:54 PM
post Re: WTS [EU]: UD2.7 thru hole pcb
[Sell / Buy / Trade]
Mads Barnkob
March 23, 2019, 04:07:55 PM
post WTS [EU]: UD2.7 thru hole pcb
[Sell / Buy / Trade]
Fumeaux
March 23, 2019, 02:12:48 PM
post Re: UD 2.7C Build
[Dual Resonant Solid State Tesla coils]
Thunderstruck
March 23, 2019, 08:03:58 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
March 23, 2019, 01:50:47 AM
post Re: Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
Hydron
March 23, 2019, 12:11:10 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
badpeter
March 22, 2019, 08:19:21 PM
post Re: Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
profdc9
March 22, 2019, 06:39:37 PM
post Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
Fumeaux
March 22, 2019, 05:51:55 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
March 22, 2019, 03:46:16 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
kamelryttarn
March 22, 2019, 11:25:19 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
March 22, 2019, 10:56:16 AM
post Re: looking for PCB creating software
[Printed Circuit Board]
Teravolt
March 22, 2019, 06:02:15 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
badpeter
March 21, 2019, 11:04:48 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Hydron
March 21, 2019, 07:51:23 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
badpeter
March 21, 2019, 07:09:05 PM
post Re: looking for PCB creating software
[Printed Circuit Board]
kamelryttarn
March 21, 2019, 02:26:09 PM
post Re: GDT Experiments
[Solid state Tesla coils]
Uspring
March 21, 2019, 11:57:53 AM
post Re: GDT Experiments
[Solid state Tesla coils]
Teravolt
March 20, 2019, 11:15:50 PM
post Re: GDT Experiments
[Solid state Tesla coils]
Thunderstruck
March 20, 2019, 09:07:04 PM
post Re: Keep or throw away ?
[Beginners]
Teravolt
March 20, 2019, 05:18:07 PM
post Re: New small SSTC
[Solid state Tesla coils]
Bambinz
March 20, 2019, 03:52:15 PM
post Re: New small SSTC
[Solid state Tesla coils]
Mads Barnkob
March 20, 2019, 01:23:52 PM
post Re: GDT Experiments
[Solid state Tesla coils]
T3sl4co1l
March 20, 2019, 01:18:29 PM
post Re: GDT Experiments
[Solid state Tesla coils]
Mads Barnkob
March 20, 2019, 01:06:24 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
March 20, 2019, 01:00:46 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
March 20, 2019, 12:41:22 PM
post Re: Keep or throw away ?
[Beginners]
Thunderstruck
March 19, 2019, 10:02:41 PM
post Re: Keep or throw away ?
[Beginners]
Hydron
March 19, 2019, 08:14:33 PM
post Re: Keep or throw away ?
[Beginners]
Teravolt
March 19, 2019, 05:12:03 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Experimentonomen
March 19, 2019, 01:32:32 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Mads Barnkob
March 19, 2019, 12:20:34 PM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
March 19, 2019, 12:15:22 PM
post Re: Which varnish to use to coat the Secondary?
[Solid state Tesla coils]
Mads Barnkob
March 19, 2019, 10:46:50 AM
post Re: Keep or throw away ?
[Beginners]
Thunderstruck
March 19, 2019, 09:11:09 AM
post Re: Keep or throw away ?
[Beginners]
Mads Barnkob
March 19, 2019, 08:24:31 AM
post Re: Keep or throw away ?
[Beginners]
Teravolt
March 19, 2019, 01:51:51 AM
post Re: Keep or throw away ?
[Beginners]
Thunderstruck
March 18, 2019, 09:56:42 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
Weston
March 18, 2019, 07:55:52 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
March 18, 2019, 06:11:07 PM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
Hydron
March 18, 2019, 02:27:35 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
Uspring
March 18, 2019, 12:52:35 PM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
FilipŠebík
March 18, 2019, 12:22:58 PM
post New small SSTC
[Solid state Tesla coils]
Bambinz
March 18, 2019, 11:46:18 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Bambinz
March 18, 2019, 11:29:02 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
March 18, 2019, 10:35:04 AM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
Marty
March 18, 2019, 05:32:43 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30