Alberta Boilers Safety Association (ABSA) Practice Test

With reversed polarity, how is the welding electrode connected?

1. The welding electrode is connected to the negative terminal

2. The welding electrode is connected to the positive terminal

3. AC power is supplied to the electrode

4. DC power is supplied to the electrode

The correct answer is: The welding electrode is connected to the positive terminal

When discussing reversed polarity in welding, it's important to understand the typical terminal connections involved. In a scenario where the electrode is connected to the positive terminal, this configuration is referred to as reverse polarity. In welding, particularly using a direct current (DC) source, reverse polarity means that the electrode is positively charged while the workpiece is negatively charged. This arrangement is significant because it influences the welding process characteristics. By connecting the welding electrode to the positive terminal, the heat generation occurs primarily at the workpiece rather than at the electrode. This results in deeper penetration and can be advantageous when welding thicker materials or in situations where penetration is critical. In contrast, when the electrode is connected to the negative terminal (known as straight polarity), the heat develops more at the electrode, making it better for thin materials and reducing the risk of burn-through. The other options provided do not fully align with the concept of reversed polarity as understood in welding practices. Understanding these nuances is critical for applying the correct settings for various welding tasks.