Columbium

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Anyone have any experience welding thin Columbium?  0.010" - 0.030" range.  TIGI'd like to hear your experiences.So far I've found the current threshold between puddle generation and colapse is tiny!Thanks~_~
Reply:Are you sure it's Columbium? The refractory metals normally have a EXTREMELY high melting point. Refractory metals are:    * Tungsten    * Molybdenum    * Tantalum    * Columbium (Niobium)John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:Niobium melting point = 4474FTungsten melting point = 6100FNiobium's thermal conductivity is listed as close to mild steel (at least at lower temps), and that is about 1/3 of the thermal conductivity of tungsten.And -man- is that some thin material you're trying to weld!
Reply:Yeah, 100% sure it's Columbium.  This stuff is bizarre.  It really resists forming a puddle.  A bead on plate, just to get a feel for how it flowed took 105A to penetrate!I work on a lot of thin stuff.
Reply:success!  I do use an auto process though...disclaimerFrontand Back Attached Images
Reply:Looks great, can you take a pic of the autoprocess machine that does it ?John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:Miller Dynasty 700automatic seam weldermagnetic oscillation~100A pulsing around 8 - 10Hz Attached Images