Which of the following is NOT selected using the welding machine?

The correct choice relates to understanding the functions and settings that are typically adjustable on a welding machine. The electrode diameter is not selected on the welding machine itself; rather, it is a characteristic of the electrode you choose to use for a particular welding application.

When performing welding, the current range refers to the amount of electrical current being used, which can be adjusted on the welding machine to suit different materials and thicknesses. High frequency voltage is also a setting that can be selected, commonly used in processes like TIG welding to stabilize the arc. Current type, which pertains to whether you are using direct current (DC) or alternating current (AC), is another setting that is adjustable on the machine to suit different welding requirements.

In contrast, the electrode diameter is determined by the type of electrode chosen for the job and directly relates to the welding task itself, but is not something that is set on the welding machine. Thus, understanding the role of each component in the welding process highlights why the electrode diameter is not selected using the machine but is instead based on the welder’s choice depending on the specific welding application.