115v Flux Core Tips

4 Comments

1. Art

   August 20, 2013 at 7:31 PM

   Using teflon for “insulation” is not a good idea. Some of teflon’s thermal decomposition products are highly toxic, up to 10X more toxic than phosgene (a war gas).

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2. McDaniel Plumbing & Heating

   August 20, 2013 at 6:25 PM

   I have a lincoln ln25, I use it mostly on my 2 portable welders, a lincoln sa2oo or a weld and power 250 with a 3 cylinder perkins diesel whitch polarity do I need to use? some times I use flux core and sometimes I use dual shield. I have a hell of a time getting the slag off. Thx Rich McDaniel

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   • john

     November 10, 2013 at 9:02 PM

     Dear Rich:

     With Flux core the polarity is NEGATIVE for the gun (Straight polarity). A common wire is NR 211 or Hobart Fabshield. Structural heavy wires like NR 232 and 233 same (Gunis Negative). I drag the gunso the flux follows. You can run vertical down on thin material or to repair undercut.

     With Dual Shield the Polarity of the Gun is POSITIVE. (Reverse polarity). The wire most common is 71-M or Ultra Core. common size is .045. You are using gas with dual shield (hence the term “Dual Shield”. You can drag or push. I run perpendicular to a slight push. If you feel ANY breeze stop and see that the weld is not totally cha-cha’d with porosity. Dual shield is NOT and out door wire. strictly indoor and ZERO WIND.

     With your machine make sure you are in constant Voltage setting. Or if only Constant Current on the Lincoln use the chart on the LN 25 to set wire speed. Flip the toggle on the LN 25 for the right polarity and CC or CV .
     thanks
     john

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3. Scott

   August 20, 2013 at 5:34 PM

   Jody,
   Like this last 115 mig video.
   I picked up a Century 115v mig years ago to do a bracket motor mount on a rooftop unit that had cracked. Was -30 degrees and no one had a replacement one in stock, no way to get a bigger welder up on the roof fast and business needed to go on.
   So I welded with flux core both sides like your corner weld. This was down and dirty but lasted many years.
   I’ve use the machine off and on over the years, but it was 10 years later when I took the unit apart because I was tired of it tripping out on high temp, only to find the plastic push on fan blade was up against the guard inside the machine. Blade had little to no dust on all sides of the blade.
   Pushed in on all the way on and have used it off and on since.
   I don’t think this newer “cheap” stuff will last 30+ years but there is a place when it does come in handy, as long as you know it’s limits.
   Thanks again for a great service you provide.
   Scott
   ps; love my tig fingers

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