Flowmeters measure the flow rate of a shielding gas in which units?

Flowmeters measure the flow rate of a shielding gas in which units?

• A. BTU or mm/sec
• B. GPH or K/min
• C. CFH or L/min
• D. PSI or kPa

Answer: (C)

Flowmeters measure shielding gas flow as a volume delivered per unit time. The common units are CFH (cubic feet per hour) and L/min (liters per minute). These units reflect how much shielding gas passes to the weld area each minute or hour, which is what matters for protecting the weld pool. Pressure units like PSI or kPa are not used for flow rate, and BTU or mm/sec aren’t appropriate because they measure energy or speed, not the amount of gas flowing.

Flowmeters measure shielding gas flow as a volume delivered per unit time. The common units are CFH (cubic feet per hour) and L/min (liters per minute). These units reflect how much shielding gas passes to the weld area each minute or hour, which is what matters for protecting the weld pool. Pressure units like PSI or kPa are not used for flow rate, and BTU or mm/sec aren’t appropriate because they measure energy or speed, not the amount of gas flowing.