How does low amperage affect the appearance of a weld bead?

Using low amperage in welding affects the heat input, which in turn influences the appearance of the weld bead. When low amperage settings are utilized, the weld pool becomes smaller and more concentrated. This leads to a bead that is characterized by being narrower and taller.

The narrowed profile occurs because there is not enough heat to spread the molten metal over a wider area, resulting in a focused bead that stands higher above the base metal. This is particularly important in certain welding applications where a precise, controlled bead is desirable, such as in structural welding or when welding thinner materials.

In contrast, higher amperage typically leads to wider, flatter beads because more heat allows for greater melting and flow of the welding material. Understanding these characteristics is crucial for achieving the desired weld bead appearance based on the requirements of a particular project or structural integrity needs.