The gas preflow and postflow times depend on which of the following?

Question

Quizplus · Accepted Answer

Gas preflow and postflow times depend on the nozzle size because the size of the nozzle determines the amount of shielding gas that needs to be directed onto the welding area. A larger nozzle requires more preflow time to establish a stable gas shield, while a smaller nozzle requires less preflow time. Similarly, the postflow time for a larger nozzle needs to be longer to ensure that the weld area is completely shielded until the weld metal cools down, while a smaller nozzle requires a shorter postflow time.

The Gas Preflow and Postflow Times Depend on Which of the Following