welding machine positive and negative polarity

Stick welding electrode positive or negative polarity 

  The electrical polarity applied to the arc via the power supply is Polarity very important for the operation of an arc process.         

   POLARITY

DCEN - Direct Current Electrode - Negative

DCEP - Direct Current Electrode  - Positive

 

SPDC -  Direct Current and Straight Polarity ( Electrode 34% temp. and Job 66% temp.)

RPDC - Direct Current and Reverse Polarity (Electrode 66% temp. and Job 34% temp.)

Polarity welding definition

The direction of flow in the arc produces the main effects.

Polarity on welding. Since there is a possibility of confusion with the direction of the current flow

In the welding literature, it is common to see current described as negative to positive electrodes in the direction of electron flow. However, according to the standard

Electrical convention, the current is described as flowing from positive to negative electrodes, or in the direction of positively charged ions. In any case, for a welding arc, electrons flow from the negative electrode (cathode) to the positive electrode (anode), but this

Different processes have different effects. In arc welding, when the electrode is negative

And the function is positive, it is referred to as DCEN (DC electrode negative) or historically

DCSP (DC Straight Polarity).

Electrons flow from the welding electrode, through

In arc and work. When the electrode is positive relative to work, it is called DCEP.

(DC electrode positive) or historically DCRP (DC reverse polarity). Other polarity options

AC (simple alternating current) and VP (variable polarity) referring to voltage waveforms that are more complex and variable than ordinary AC? In both cases, polarity and

Alternatively the direction of electron flow.

The effect of polarity on heat input and arc behavior varies with the characteristics of the process and the material being welded. For GTAW, produces DCEN prominence

Heat in work and the most common is the polarity. Because of tungsten

The electrode can be heated to extremely high temperatures without melting. Extremely

At high temperatures, electrons are easily emitted or "boiled" from tungsten electrodes

(Cathode) by a process known as thermionic emission. It produces a constant arc with

The majority of arc heat deposition occurs at the workplace where electrons are deposited.

 

DCEP

                         

Tungsten arc is irregular due to the difficulty of the electron, operating with DCEP polarity
Emissivity at low work temperature. But DCEP can be beneficial when welding
The process of electron emission since aluminum can help remove the diluted aluminum oxide
From the surface, a process is known as the cleaning action. This is where AC current can be beneficial because it saves half the cycle of DCEN, which heats the workpiece, and one half cycle
DCEP, which removes the oxide.

DCEN

With GMAW, DCEN is not usable since the lower temperature of the melting bare electrode
The wire cannot receive thermionic emission. Thus, DCEN produces an arc that is very uncertain and
It is difficult to control. With DCEP, the work is negative and goes into the greatest amount of heat
The part where electrons can be emitted more strongly. It is mainly caused by oxide
The work surface, which facilitates the electron emission process. The end result is too high
Static arc, which is why DCEP polarity is used almost exclusively with GMAW.
Processes, where the flux is used such as SMAW, FCAW, and SAW, can use DCEP, DCEN
Or AC polarities, depending on the type of flow and application. Flux additions that are in
Contact with the welding electrode may promote electron emission when the electrode is
Cathode (DCEN). This allows DCEN polarity to be an effective process choice. in some
In cases, DCEN can be chosen to produce a higher deposition rate due to greater electrode-heating with less heat input for work. It can also be used for welding thinners'
material.