What is the typical polarity used for MIG welding?

In MIG welding, the typical polarity used is direct current positive (DCP). This setup involves connecting the MIG welding machine to the workpiece through the positive lead, which allows for better arc stability and a smoother welding process. With DCP, the welding electrode, which is continuously fed through the gun, is connected to the negative terminal, while the base metal is connected to the positive terminal.

This polarity helps achieve deeper penetration into thicker materials and provides effective heat transfer because the arc is concentrated at the workpiece. It also aids in minimizing the formation of spatter and results in a cleaner weld appearance. Using DCP is generally preferred for most MIG welding applications, particularly when welding materials like steel or stainless steel, due to the quality and control it offers over the weld.

The other options, such as alternating current and different polarities like ACN or ACP, are not suitable for typical MIG welding operations, as they do not provide the same level of arc control and penetration that DCP does.