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Mishto 220 amp mig,tig,stick.

Posted: Wed Jul 31, 2024 11:57 pm
by Learner tig welder.
Hi everyone, i have a question about changing my mig polarity to negative gun positive earth, how is that achieved on my machine??

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 12:03 am
by tweake
really need to know exact model to be sure. but quick google shows that you swap over a lead which is inside the machine next to the wire spool. one connection is marked flux core.
if in doubt post pics.

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 12:05 am
by Learner tig welder.
Hi, I have looked inside and cannot find where to change gun polarity.

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 12:08 am
by Learner tig welder.
Hi, model is lwnb1509a3687.

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 12:34 am
by Learner tig welder.
20240801_135500.jpg
20240801_135500.jpg (2.72 MiB) Viewed 14041 times
this is the machine

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 1:14 am
by Learner tig welder.
I'm assuming that if you change earth lead from negative to positive it gives you what is needed for flux core wire?

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 1:23 am
by Jack Ryan
Is it similar to this one?

https://www.ebay.com.au/p/18006846932

Is there a polarity swap terminal set inside the wire bay like this?
s-l1600.jpg
s-l1600.jpg (273.19 KiB) Viewed 14026 times
Jack

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 1:49 am
by Learner tig welder.
Thats a 250 amp which are different.

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 1:57 am
by Jack Ryan
Learner tig welder. wrote: Thu Aug 01, 2024 1:49 am Thats a 250 amp which are different.
Different how?

I think you need to be a bit more forthcoming with information. Do you have a manual? Does it say that both MAG/MIG and FCAW-S are supported? Is there anything similar to what I posted on yours? What about a picture?

Jack

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 1:59 am
by tweake
can you take a pic of the wire spool area? any buttons, switches, leads etc. i would not be surprised if its not changeable despite the claims that its gasless.

looks like your one is a slightly older model. its also sold under various other names eg rossi.
i havn't found a good manual for it, which is not uncommon with these sorts of machines.

Re: Mishto 220 amp mig,tig,stick.

Posted: Thu Aug 01, 2024 9:16 am
by cj737
Learner - What you are trying to do is to swap from DCEP to DCEN. Most older MIG machines have a stud inside the cabinet where you can swap the polarity. It looks something like this (photo attached). You should find it near the spool area, perhaps around where the gun cable penetrates the roller assembly.

If you can swap it, make sure to swap it back to run standard hardwire MIG from FluxCore wire.

Re: Mishto 220 amp mig,tig,stick.

Posted: Sat Aug 03, 2024 2:40 am
by Learner tig welder.
Hi everybody, the only connection inside spool area is a negative terminal no other cable in there, the positive cable runs inside of wire feed.

Re: Mishto 220 amp mig,tig,stick.

Posted: Sat Aug 03, 2024 4:32 am
by tweake
sounds like its a gas mig only.
btw does it even come with fluxcore rollers ? https://www.boc.com.au/shop/en/au/boc-1 ... 03-05-00-p

trade it in on something better. make sure you get one with fluxcore rollers.