Magnetic arc blow

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Now and then I am called on to repair magnet tubes for magnet trays used in the sugar industry.  They are S/S tubes with rare earth magnets stacked inside, end to end making a magnetic rod.  There are probably 20 of these rods in a magnet tray.  Some times the end of the S/S tube will crack off and need welded back on using TIG process on 316 s/s. I am always welding s/s to s/s.  Never to the magnet.  In the past I welded these using my old A/O Smith transformer welder and had no issues.  I now have a Miller XMT 304 and can not get my arc to control worth a darn.  Tried the same settings on a piec of s/s angle away form the magnet and the arc was fine.  I have a Pow-Con I could hook up and try.  I don't own a transformer welder any more.  Have not tried my Miller 301G either.Any ideas why a transformer machine works around magnets and an inverter has trouble?ThanksDan D.
Reply:I have used AC to weld around magnets before. I have repaired those same tubes in chemical plants.I don't remember the rods used, they were spec'd by the CWI, but they were 316 designed for AC/DC.The more I use inverters the less of a fan I am.Give me a good ol' transformer anyday Semper FiJesus may have been a Carpenter, but his dad was a Millwright" A grinder and a can of paint, will make a welder what he aint' "I've done so much, with so little, for so long, that now I can do anything with nothing!