3 Welding Polarities. Direct Current Straight Polarity Direct current straight polarity happens when the plates are positive and the electrode is negative. Using the wrong polarity will lead to lots of spatter bad penetration and a lack of control of your weld.
Variable polarity plasma arc welding VP-PAW is an arc welding process that produces coalescence of metal by heating with a constricted arc between an electrode and the workpiece transferred arc or between the electrode and a constricting nozzle nontransferred arc. In most cases DC is the preferred welding polarity. An electrode polarity chart based on AC or DC current and type of Stick welding electrode.
Both of them come with respective subtypes.
Using the wrong polarity will lead to lots of spatter bad penetration and a lack of control of your weld. TIG Welding Voltage Type and Welding Polarities Both AC and DC currents are used. 3- Using Electron welding to weld Aluminum. This produces a deep penetration weld.