What polarity is used when the ground cable is connected to the negative terminal?

The correct choice reflects the designation of Direct Current Electrode Positive (DCEP) when the ground cable is connected to the negative terminal. In this configuration, the electrode is connected to the positive terminal, allowing for a more stable arc and deeper penetration into the base material.

Using DCEP is particularly common in processes such as TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding, where it enhances the welding quality by improving metal transfer and providing better heat concentration at the workpiece. This causes more heat to be directed into the base material rather than the electrode, which is beneficial for achieving strong welds.

Understanding this connection is critical during welding, as it affects the overall performance and outcome of the weld, including its strength and appearance. Other forms of polarity, such as DCEN (Direct Current Electrode Negative) or AC (Alternating Current), are used in different contexts for specific applications, but they do not apply to the scenario described in the question where the ground cable is connected to the negative terminal.