Mig Question

[twarren]

When mig welding with argon; is the ground clamp + or - ?

Thanks,

warren...........

 

[Professur]

yes.

 

[BigMike782]

With solid wire and gas ground is negative.

 

[Zeke]

...or DCEP.

 

[pepi]

Solid wire & gas it is - neg

If welding using flux core it should be + pos

 

[that-guy]

Solid wire & gas it is - neg

If welding using flux core it should be + pos

this!!!

 

[RumT]

No sticker/guide inside the cover of the machine?

 

[Guster]

No sticker/guide inside the cover of the machine?

If so, take the time to mark it and leave a little note for next time unless you only ever plan to weld one way. You never know.

The machine I 'inherited' had no polarity markings or anything. Once I was sorted with the multimeter my label maker was smoking by the time I was done.

 

[Kevin54]

When mig welding with argon; is the ground clamp + or - ?

Thanks,

warren...........

With solid wire and gas ground is negative.

Solid wire & gas it is - neg

If welding using flux core it should be + pos

Well....I just learned something new today. I'm going to write that down and stick it inside of my welder.

In lieu of that though, can someone explain the scientific reasoning behind why the reverse grounding for Flux Core?

 

[Professur]

To burn the flux

 

[toofart]

The reason self-shielded wires need EN has to do with physics and chemistry.

Air contains nitrogen and oxygen, both of which will react with iron, especially at high temperatures. Because N and O are both "nonmetals" they tend to form negative ions.

Having the melting wire negative repels the ionized oxygen and nitrogen from the wire, and attracts these negative ions to the weld puddle.

OK, so now your *wire* is safe from being oxidized, but the now you've made the weld puddle the target of the greedy oxygen and nitrogen. Unlike the wire, though, the puddle is (somewhat) protected by the layer of molten flux. The flux contains oxygen absorbers, it also acts to slow the speed at which O and N can diffuse into the metal itself.

If the wire were positive, oxygen and nitrogen would gobble up the outer steel wire, before the flux inside had a chance to protect it.


https://answers.yahoo.com/question/index?qid=20090608111131AASQ4my

 

[Steevo]

The reason self-shielded wires need EN has to do with physics and chemistry.

Air contains nitrogen and oxygen, both of which will react with iron, especially at high temperatures. Because N and O are both "nonmetals" they tend to form negative ions.

Having the melting wire negative repels the ionized oxygen and nitrogen from the wire, and attracts these negative ions to the weld puddle.

OK, so now your *wire* is safe from being oxidized, but the now you've made the weld puddle the target of the greedy oxygen and nitrogen. Unlike the wire, though, the puddle is (somewhat) protected by the layer of molten flux. The flux contains oxygen absorbers, it also acts to slow the speed at which O and N can diffuse into the metal itself.

If the wire were positive, oxygen and nitrogen would gobble up the outer steel wire, before the flux inside had a chance to protect it.


https://answers.yahoo.com/question/index?qid=20090608111131AASQ4my

Awesome explanation!

 

[rockwithjason]

Awesome explanation!

yup, a slam dunk

 

[Rookie2]

The reason self-shielded wires need EN has to do with physics and chemistry.

Air contains nitrogen and oxygen, both of which will react with iron, especially at high temperatures. Because N and O are both "nonmetals" they tend to form negative ions.

Having the melting wire negative repels the ionized oxygen and nitrogen from the wire, and attracts these negative ions to the weld puddle.

OK, so now your *wire* is safe from being oxidized, but the now you've made the weld puddle the target of the greedy oxygen and nitrogen. Unlike the wire, though, the puddle is (somewhat) protected by the layer of molten flux. The flux contains oxygen absorbers, it also acts to slow the speed at which O and N can diffuse into the metal itself.

If the wire were positive, oxygen and nitrogen would gobble up the outer steel wire, before the flux inside had a chance to protect it.


https://answers.yahoo.com/question/index?qid=20090608111131AASQ4my

I just made a sticker of this to attach to the inside of my welder !

 

[Twisted Sid]

Here is the tag inside my Lincoln 140

 

[zkling]

The reason self-shielded wires need EN has to do with physics and chemistry.

Air contains nitrogen and oxygen, both of which will react with iron, especially at high temperatures. Because N and O are both "nonmetals" they tend to form negative ions.

Having the melting wire negative repels the ionized oxygen and nitrogen from the wire, and attracts these negative ions to the weld puddle.

OK, so now your *wire* is safe from being oxidized, but the now you've made the weld puddle the target of the greedy oxygen and nitrogen. Unlike the wire, though, the puddle is (somewhat) protected by the layer of molten flux. The flux contains oxygen absorbers, it also acts to slow the speed at which O and N can diffuse into the metal itself.

If the wire were positive, oxygen and nitrogen would gobble up the outer steel wire, before the flux inside had a chance to protect it.


https://answers.yahoo.com/question/index?qid=20090608111131AASQ4my

I've read this theory a number of times over the years and have discussed it with a handful of welding engineers (yes I'm a welding nerd). IMHO There are quite a few holes in that theory though. For example, care to explain how flux cored wires, designed to run on DCEP work?

 

[king nero]

We use (more than one) self shielding FCAW that needs to be welded on the (+).
So, not all FCAW needs DCEN.

 

[toofart]

For example, care to explain how flux cored wires, designed to run on DCEP work?

IMHO There are quite a few holes in that theory though.

You first, bud. I'm just the messenger.

 

[toofart]

Here is the tag inside my Lincoln 140

If you look at your diagram, FCAW (Flux-Cored Arc Welding) has the electrode tip connected to the Negative post. The ground is connected to the positive branch.

 

[Professur]

It was my understanding that DC+ flux core was meant to be used with an outer protection of gas

https://www.lincolnelectric.com/Catalog/consumableseries.aspx?browse=104|13275|

 

[zkling]

It was my understanding that DC+ flux core was meant to be used with an outer protection of gas

https://www.lincolnelectric.com/Catalog/consumableseries.aspx?browse=104|13275|

No, those wires are for the FCAW-G process which uses gas shielding in addition. I don't recall the numbers off the top of my head but Lincoln and Esab both produce a number of self shielded wires that run DCEP for the FCAW-S process.

 

[plow]

I'm so confused.