correct cfm for mig welding

by Steve From Ohio
(Ohio)

I have been using flux core for many years and am new to Mig welding.

Question on the gas. I'm using argon co2 and I am finding that the cfm is a question for me.

First, when you first start welding, is the gas present at the tip or is there a short time that the gas is not present and is that part of the weld not as good as the rest?

Second, is there a rule of thumb for the correct gas pressure for migging different materials and thicknesses or is there just one setting for everything?

Thanks!

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good question. the gas must get there pretty quick. i have never had issues with the beginning of the bead having defects unless something else was wrong.

the flow rate is more dependent on nozzle size and how breezy it is than any thing else.

there are different size nozzles and the bigger the nozzle , the more flow rate is required and vice versa.