Polarity in D.C. power source
The polarity of a machine refers to the direction of the current flow. The polarity can be obtained only in D.C. Polarity may be straight or reverse.
Types of Polarity in Arc Welding
- Reverse Polarity
- Straight Polarity
1. Reverse Polarity
When the electrode cable is connected to the positive terminal, it is called positive polarity or reverse polarity.
2. Straight Polarity
When the electrode cable is connected to the negative terminal as it is called negative polarity or straight polarity.
Note: A.C. has no polarity
The total heat produced in D.C. arc consists of 2/3 heat from the POSITIVE Terminal (66%) and 1/3 heat from the NEGATIVE Terminal (33%).