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Shielding Gas Flow Calculator

Calculate recommended shielding gas flow rate and tank duration for MIG and TIG welding based on nozzle/cup size and conditions.

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MIG and FCAW use nozzle sizing; TIG uses cup numbers.

Nozzle diameter on your MIG gun. 5/8" is the most common size.

Outdoor welding needs 25-50% more gas flow to compensate for air movement.

TIG requires 100% argon. MIG on steel uses 75/25 or CO2. Aluminum MIG needs 100% argon.

Larger tanks last longer and cost less per cubic foot. 80 cu ft is portable; 250 cu ft is a full shop cylinder.

Recommended Flow Rate
15-20CFH
Standard indoor flow rate for MIG welding with 75% Argon / 25% CO2. This should provide good shielding coverage. Listen for a smooth, consistent arc — crackling or popping can indicate inadequate gas coverage.
Tank Duration
7.1 hours
Based on 125 cu ft tank at average flow rate of 18 CFH
Estimated Daily Cost
$25.20/day (est. 6 hrs welding)
Based on ~$30/tank for 75/25 mix

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