Contact us on 954-540-0408 or info@theweldinglife.com
Contact us on 954-540-0408 info@theweldinglife.com
Straight Electrical Polarity

Electrical Polarity

Last time, we talked about reverse polarity. Hopefully, that is somewhat understood. Now the talk will be dealing with electrical straight polarity.

 

electrical polarity

As we can see, the electrode is attached to the negative terminal on the power source and the work (metal to be welded) is attached to the positive terminal. This is the basic setup for DCEN. So what exactly is going on and why do we need to know about this?

 

DC_Electronegative

Electrons flow naturally from negative to positive and that has an effect in terms of heat when it relates to welding.

electroNegativeStraightPolarity

So we get more heat and penetration on the work when we are in DCEN as opposed to DCEP. In SMAW (stick welding) this effect might not be that apparent but with GTAW (tig) it is a different story.

 

GTWA_tig_welding

When we tig weld everything except aluminum and magnesium, we will be using direct current. With direct current, we have two choices. Reverse polarity or Straight polarity. Which polarity is the best choice? Straight of course. Why? Because we want to keep our tungsten tip sharp and pointed, not balled like the one in the picture (bottom right).

How does the tip remain sharp? Well if you look at the chart above, you will see that since the electrons are leaving the electrode and making contact with the work (DCEN) and 70 % of the heat is taking place at the work, the tungsten can maintain its pointed shape.

When the electrons leave the work and make contact with the electrode (DCEP) and 70 % of the heat is taking place at the electrode, the tungsten can’t maintain its pointed shape and starts to ball up.

So…

What electrical polarity would I need to choose for Alternating current?

To be continued….

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7 Comments on "Straight Electrical Polarity"

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Rob
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Love the last picture. Looking very fashionable 😉 I think I see a new trend that’s about to catch on at any moment!! “Welder chic” they’ll call it…

KD
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Loving this site, very informative, keep up the good work.

Nick
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Great site, lots of helpful information to help further strengthen what was discussed in class.

Tyler
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Very helpful

Brandon Miller
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thanks I now have a much better understanding of Electrical Polarity honestly before this i was completely lost

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