Final answer:
Welding tip orifice sizes are designated by a number that indicates the diameter of the orifice. The smaller the number, the smaller the orifice size. The orifice size determines the amount of shielding gas that flows through the tip during welding.
Step-by-step explanation:
In welding, the sizes of welding tip orifices are designated by a number that indicates the diameter of the orifice. This number is usually stamped on the tip itself. The smaller the number, the smaller the orifice size. For example, a welding tip with a size 1 has a larger orifice than a welding tip with a size 4.
The orifice size determines the amount of shielding gas that flows through the tip during the welding process. A larger orifice allows more gas to flow, while a smaller orifice restricts the gas flow. The correct orifice size is important for achieving the desired weld quality and penetration.