Tig copper?

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Was just messing with tigging some copper pipe today. WOW the puddle freezes fast! Seems it goes from a solid to a liquid near as thin as water in a flash then back near as fast. Like Aluminium, not much to go on by color either. I did find to it tended to get gas bubbles, any reason for this?DC ~125 amps 3/32 electrode 1/16 filler, He-Ar gas.Lincoln PT185 TIGLincoln 175 MIGLincoln 240 amp AC StickLind Needle Arc plasma welderPlasma cutter, soon???
Reply:Wonder if you should try AC, Pure Ar, Green electrode.....never tried it but think I am going to...BrandonLincoln Tombstone 225 A/C Steel StickerOld Victor O2/Acetylene setupMiller Syncrowave 250 Tig/PC-300 PulserMiller Millermatic 212 Mig HTP Invertatig 201 Giant Teck D50 Plasma cutterLots of HF grinders
Reply:did you use Deoxidized copper filler?
Reply:Yes, cleaned the parts and filler, shielding gas was maybe a little low, tried again with new gas bottle and 30 l/m, one size bigger cup found a little less porosity. Still it's funky stuff to weld. Pretty sure DC is what is needed.Lincoln PT185 TIGLincoln 175 MIGLincoln 240 amp AC StickLind Needle Arc plasma welderPlasma cutter, soon???
Reply:I have welded regular copper water line using silicon bronze as filler. That works good. Just used dc with straight argon. It does take a minute to puddle then you have to move fast. All cleaned up and polished it looks cool though thats for sure.
Reply:http://weldingweb.com/vbb/showthread.php...ght=copper+tig
Reply:Well, my welds certainly did not look like that, but I might have been working at a disadvantage equipment wise. Neat stuff.Lincoln PT185 TIGLincoln 175 MIGLincoln 240 amp AC StickLind Needle Arc plasma welderPlasma cutter, soon???