What type of current is primarily used in TIG welding?

In TIG (Tungsten Inert Gas) welding, both Direct Current (DC) and Alternating Current (AC) can be utilized, which is why having the option of both current types is the correct answer.

DC is typically used for welding ferrous metals and provides a stable arc with deeper penetration, making it suitable for materials like steel and stainless steel. AC, on the other hand, is often employed when welding non-ferrous metals, such as aluminum, because it allows for better cleaning of the oxides that naturally form on aluminum surfaces, leading to improved weld quality.

The ability to switch between DC and AC settings in TIG welding machines provides versatility, allowing welders to choose the most appropriate current type based on the material being welded and the specific requirements of the job. This adaptability is crucial in practice, as different materials present unique challenges, and the ability to use both types of current makes TIG welding suitable for a wider range of applications.