On power sources set up for reverse polarity, which terminal supplies welding voltage and amperage?

In MIG welding, particularly when using a power source set up for reverse polarity, the positive terminal is where the welding voltage and amperage are supplied. This setup means that the electrode is electrically positive, while the workpiece is negative.

Using reverse polarity is advantageous in MIG welding because it allows for better heat concentration in the weld pool, leading to enhanced penetration into the base material. This is especially important for welding thicker materials or when a strong fusion is required. The arc characteristics are optimized, promoting smoother operation and reducing spatter, which helps in achieving a cleaner weld.

The other terminals do not supply the welding voltage and amperage during this process. The ground terminal serves its purpose in completing the electrical circuit for safety and stability but does not provide the welding current itself. Understanding the role of the positive terminal in reverse polarity gives insight into better weld quality and performance in MIG welding applications.