Flux Wire Welder

I have a multi mig model 90070-71 120v welder.I know it has a gas hook up but can it be a Flux Core welder to?

I got the welder in a trade and it came with flux Core Wire in it but doesn’t weld worth a dang.Is the the problem with it?Does it have to have gas?

Flux core wire or inner shield wire was originally designed for gas shielding. Probably no problems with the welder. Does it have to have gas – no. Most flux core non Gas Welding is just what you are experiencing not worth a hoot. You probably have atmosphere getting into the weld zone from a draft or breeze. It can be done but everything must be in place to achieve a good weld. Also you may want to block off the gas passages at the torch nozzle so no air can be drawn into the weld through the gun (just added security). Check to see if the wire is “self shielding” if not get new wire.
Here are a couple of sites that may help,

http://www.weldingtipsandtricks.com/index.html

http://ezinearticles.com/?expert_bio=Jody_Collier

http://www.weldreality.com/Self%20Shielded%20Flux%20Cored.htm

(32 years welding)

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