What gas flow rate should I use for a specific thickness of material?
(top) The flow rate is a function of the welding parameters and the nozzle dimensions. A good recommendation is 1 Liter/minute of flow for every millimeter of opening of the nozzle in the welding gun. This translates into roughly 7 cfh for every 1/8 inch of nozzle opening. For example if the nozzle is 1/2 inch, this is equal to 4/8 inch. Therefore the required flow is a minimum of 4 X 7scfh or 28 standard cubic feet per hour. If porosity is noticed, increase slightly the gas flow rate. When welding in drafty environments or at high welding travel speeds shielding gas flow rates of 50 scfh are not uncommon.
