WELDPRO MIG155GD, Руководство оператора, Страница: 22 / 36

ELECTRICAL VOLTAGE
Three additional considerations that need to be addressed and understood, with each type welding that your new MIG155GD is
capable of producing are voltage, amperage and most importantly, Electrical Polarity.
Think of voltage as the electrical equivalent of water pressure, and amperage as the electrical equivalent of the flow rate of that
water. With electricity, the more amperage the more heat and the more voltage, the more it pushes that heat through the
electrical circuit.
There are basically two types of electric current. AC (alternating current) and DC (direct current). Direct current travels around
its circuit in only one direction, while alternating current switches its direction back and forth in the circuit, in the USA, 60 times
per second, or 60hz.
Your new MIG155GD is a DC (direct current welder) which means the current or (amperage) travels only in one direction.
However, you have the ability to manually change that direction as needed for the choice of three welding types available with
the MIG155GD.
You can choose from either “electrode positive” or “electrode negative”. Current in an electrical circuit travels from negative (or
minus) to positive (or plus). Your electrode, is your torch gun, and your ground or work cable is what is attached to the metal
being welded. You can chose to direct the current in the circuit toward or away from your welding torch end (electrode) as it
travels in its circuit.
When welding using either the MIG style or MMA style of welding we want our polarity to be “electrode positive”. With current
always traveling from negative to positive, (minus to plus). Doing so forces the current to travel toward our torch end which
creates more heat at the consumable welding material being used in our torch, which produces a smoother better penetrating,
more evenly melting weld.
When choosing Flux Core welding however, with the thinner more delicate flux core wire, we choose “electrode negative”. This
changes the direction of the current helping to prevent the flux core wire from prematurely melting off from overheating by
directing the current flow toward the work (or ground) and away from our electrode.
A little tidbit of information that might help prevent confusion. The direction of polarity is also sometimes referred to as DCEN
or DCEP. Direct Current, Electrode Negative or, Direct Current Electrode Positive. And to further complicate their names, in
addition, they also refer to the polarity as either Straight Polarity or Reverse Polarity, with electrode negative being straight
polarity and electrode positive being reverse polarity.
Many welders in the USA have a funny way of remembering all this by oddly enough using two names of government officials.
SENators and REPresentatives. Just remember SENator as Straight polarity Electrode Negative, and REPresentative as Reverse
polarity Electrode Positive. Hope that little secret helps you remember!
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ELECTRIC
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