Wire Contamination

[JWELD]

Will MIG Flux Core wire become as easily contaminated, mainly rust, as easily as steel.

[cope]

Being an un-coated wire rust might be more prevalent, but the flux may also pull it to the slag.

[klsm54]

Flux cored wire is much more susceptable to humidity changes than solid wire. The flux in the wire can pick up moisture, just like the flux coating on stick electrodes.

Many coded welding operations use wire ovens to store flux cored wires in when they are not in use.

If the wire is exposed to enough moisture to cause it to rust, you can be assured that the flux properties have also been affected.

Interesting reading on the subjest can be found here....Moisture in FCAW wire