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Tool Talk Discussion Forum

Welder Polarity

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Carol Martin

04-22-2005 08:58:22




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Hi:
I recently picked up a Lincoln 225/175 AC/DC welder. I have had an AC for years. Can someone tell me the reason for -/+ DC polarity? I know the current flows in Different direction But when do you use each one.. When you Select - DC does that mean the electrode is the Neg and the ground is the Pos.

Thanks




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Ultradog MN

04-25-2005 15:36:46




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 Re: Welder Polarity in reply to Carol Martin, 04-22-2005 08:58:22  
Carol,
DC will give you superior penetration over AC. I'm talking straight steel fabrication here and not welding something exotic.
You may not notice much difference in your welds - maybe a little less splatter- using DC over AC but you'll be a better welder for using it.
Most of the DC welders are really just AC run through a full wave rectifier to get DC. If you ever get a chance to try a True DC machine like one of the older Lincoln MG (electric motor running a DC generator) rigs, you would notice the wonderful smoothness and great "push" (penetration). Second best is one of the engine driven DC generators. Equally good push but not quite as smooth.
Have fun with your new machine.
Jerry

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jdemaris

04-23-2005 05:23:32




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 Re: Welder Polarity in reply to Carol Martin, 04-22-2005 08:58:22  
You can read up on the theorectical, and also find out how it works in most actual working situatons. The reality is, from what I've experienced, you won't notice much difference with mild steel electrodes most commonly used - like 6011 (for deep penetration or rusty metal) or 6013 or 7014 (mild steel - low penetration). If you are using a low-hydrogen higher-tensile strength rod, e.g. 7018 - is will weld easier/smoother with DC. But, if you store it in a warm and dry place, the difference won't be great. 7018 stored in an open container absorbs moisture pretty fast and gets lousy to use- at least here in the damp Northeast. Years back, there was a lot of rod around that was very sensitive to polarity - some only made for DC use, but I don't see it around anymore - e.g. 6010, 7010, etc. One thing I have noticed. Anytime I'm running a welder off a remote power-source, e.g. a PTO generator or gasoline generator - instead of off the power-company grid - the welding goes much smoother. I can weld with my AC only welder off a generator just as smooth as my DC welder on the grid - I don't know exactly why - but obviously it has something to do with the input.

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dr.sportster

04-22-2005 10:18:42




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 Re: Welder Polarity in reply to Carol Martin, 04-22-2005 08:58:22  
Remember senators and representatives.You will never forget.SEN[ators]=straight elctrode negative REP[resentatives]=reverse electrode positive.



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BBx

04-22-2005 10:17:44




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 Re: Welder Polarity in reply to Carol Martin, 04-22-2005 08:58:22  
This link give some good information.



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Jim/41_9N

04-22-2005 09:39:39




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 Re: Welder Polarity in reply to Carol Martin, 04-22-2005 08:58:22  
Carol,

DC Electrode Negative (DCEN) is also called Straight Polarity. Here the electrode is Negative and the work is positive.

DC Electrode Positive (DCEP) is also called Reverse Polarity. Here the electrode is Positive and the work is negative.

DCEP will give greater penetration than DCEN at the same setting. Also some electrodes are made to run only in one or the other polarities.

Maybe someone else can shed more light on the subject.

Jim

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