Miller mig, what pressure to normally run

[tractorboy5500]

I been using a miller mig, solid wire with gas mix, i was told to run about 30 psi when i got it. But was talking to some people at the welding supply store, they run about 15 to 25 psi on there's, thought someone might know the correct pressure setting. I have the miller 180, thanks.

 

[crazyal]

I vary mine depending on the conditions. Inside I normally leave it at 20 psi but if there's a fan or another source of air flow I'll bump it up some, 25 to 30. If outside I may have to go higher.

 

[Agrantina]

Yes- indoors you dont have to run the higher gas pressure (30psi) to shield the weld..I would run 20 psi..Outside or indoors with a fan going you need more gas 25 to 30 psi.... You can actually see an hear the arc when the gas is high and low. Weld indoors with 20 psi...Now weld the same way with a fan on and you can see the difference. Now you know when to turn the gas up...

AndyG

 

[BXpanded]

Not to be picky, but the gauge is probably graduated in CFH (cubic feet per hour) not PSI.
Try as low as 15 or 20. Go up if you get spots of porosity. The "right" flow is very dependent on your technique and surroundings. The only real downside to having too much flow is gas usage.

 

[Scooby074]

15 CFH indoors.

More if your getting porosity

 

[Shield Arc]

It's always best to check the welding wire manufacture's suggestion. Some dual shield wires I have require 35 to 40-cfph, and they're not joking, anything less and the wire has issues!

But as everybody else has said so far, indoors with Lincoln's L-56 Mig wire I run 15-cfph.

 

[Mark @ Everlast]

It's always best to check the welding wire manufacture's suggestion. Some dual shield wires I have require 35 to 40-cfph, and they're not joking, anything less and the wire has issues!

But as everybody else has said so far, indoors with Lincoln's L-56 Mig wire I run 15-cfph.

I have noticed the same thing. Some wire requires more than others. But in general 20-25 for most things will take care of it, but I go as low as 15, depending upon my nozzle size.

 

[kennyd]

I run mine between 20 and 25 CFH, I adjust with the trigger pulled (loosen the drive roller first so as not to feed the wire)

 

[JD Greg]

Indoors, I run mine at 20.

 

[RPW]

I usually run mine between 10 to 15 indoors. Normally don't use MIG outdoors unless it's done on a calm day. If breezy I switch to either stick or FCAW.

 

[yomax4]

It's all about shielding. If you can run at 12 cfh with no porosity, Turning it up to 24 would use 2x as much gas. If all is running well, Turn it down and save some $$. Your welds will tell you what to set it at.

 

[LD1]

It's all about shielding. If you can run at 12 cfh with no porosity, Turning it up to 24 would use 2x as much gas. If all is running well, Turn it down and save some $$. Your welds will tell you what to set it at.

This is my take.

And your guage is probabally indeed CFH and NOT PSI.

Basically, take some scrap steel and start turning it down until the welds start to get pin-holes in them (porosity). Then turn it up a tad. Any more is just wasting gas.

 

[crazyal]

It could be either. My Harris gauge that came with my Lincoln is in PSI but my floating ball gauge regulator, Victo I think, is CFH. I was told that PSI is used for ease of set up since you don't need to flow gas but is not as accurate. I've never had a CFH meter in a round dial gauge, just the floating ball style that requires gas to flow to be set up.

 

[tractorboy5500]

Thanks guys, this gives me a good idea what to run, and save me a little gas also. thanks again. Allan