Bad Mig Tacks: Craters

[Maxakarudy]

In the old days we used to use a Maltesser, if it hovered 1/2" off the nozzle that was about right.

[Overkill]

Another problem I've seen regards the o-rings, or not having the torch seated correctly in the machine. If the o-rings are bad, it will allow air to get into the flow, and/or, allow the shielding gas in the hose to flow out between welds. Also check for leaks between the regulator and the point where the torch is connected.

If the torch isn't seated correctly, the gas holes won't line up.

Changing liners was a good first choice. Flux cored wires tend to be dirtier because of the process that is used to make them - but the flux lifts the contamination out of the weld. Solid wires are clean, and only have the shielding gas to rely upon.

One common problem we used to run into all the time, is someone trying to run aluminum wire and steel wire through the same liner. Need a teflon for aluminum and a steel liner for MIG.

[longyard]

John, and everybody....Thanks for your helpful suggestions on this. I started at the bottle and checked every connection for gas flow. I took the cover off the machine and checked to see if the solenoid was working, it was. I then removed the wire-feed hose and... ta da!!!... it hadn't been seated fully the last time I changed the inner liner. Dumb mistake by me.

Maxakrudy's flow tool is now on the shopping list! Again, thanks!