How is the size of a welding tip indicated?

The size of a welding tip is indicated by its diameter, which is typically measured in either inches or millimeters. This measurement reflects the orifice size through which the gas flows, affecting the heat and size of the flame produced. For example, a tip designated as "0.5" would have a 0.5-inch diameter. Additionally, welding tips are often categorized by numbers (e.g., #0, #1, etc.), where larger numbers correspond to larger diameters.