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Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

Hi everyone, i have a question about changing my mig polarity to negative gun positive earth, how is that achieved on my machine??
tweake
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    Mon Dec 18, 2017 4:53 am
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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.
tweak it until it breaks
Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

Hi, I have looked inside and cannot find where to change gun polarity.
Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

Hi, model is lwnb1509a3687.
Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

20240801_135500.jpg
20240801_135500.jpg (2.72 MiB) Viewed 14042 times
this is the machine
Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

I'm assuming that if you change earth lead from negative to positive it gives you what is needed for flux core wire?
Jack Ryan
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    Wed Mar 24, 2021 10:20 pm
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    Adelaide, Australia

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?
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s-l1600.jpg (273.19 KiB) Viewed 14027 times
Jack
Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

Thats a 250 amp which are different.
Jack Ryan
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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
tweake
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    Mon Dec 18, 2017 4:53 am
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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.
tweak it until it breaks
cj737
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    Thu Sep 29, 2016 8:59 am

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.
Attachments
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Learner tig welder.
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    Thu Jul 25, 2024 11:28 pm

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.
tweake
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    Mon Dec 18, 2017 4:53 am
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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.
tweak it until it breaks
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