Black soot around MIG tacks?

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Anyone experienced this? I lay down a quick 1 second tack and I get this sooty black ring over it.The tack itself is fine, nice and clean no porosity or anything it's just dirty soot like charcoal dust almost.I searched and found some results but no solutions.I'm using a Hobart 210mvp at 15cfh c25 welding mild steel cleaned with flap disc 1" x 1/8" wall tube. I turned the gas up to 20 and saw to change.Last edited by BrooklynBravest; 11-20-2014 at 03:18 PM.www.FirehouseFabricators.comZachLincoln 210mpLincoln SW200Hypertherm Powermax 45xp2x4 CNC Plasma Table.
Reply:For what my opinion is worth I think you gas is too low. I run my gas at 25cfh and never have a problem.
Reply:Happens to me all the time too.  The black soot wipes off with a paper towel.  I just thought it was normal till now.  ????Syncrowave 210HH140Victor O/A
Reply:Originally Posted by MetalJunkieHappens to me all the time too.  The black soot wipes off with a paper towel.  I just thought it was normal till now.  ????
Reply:Do you clean the weld area with a solvent? Dark black might be oil/ grease/ cutting coolant burning off and leaving carbon.The brown to light brown soot are iron oxides... Might have your volts a bit too high if your seeing a lot of it.
Reply:I would expect that on Aluminum, not steel. If you see that, you probably aren't getting enough gas.Miller Multimatic 255
Reply:I would say it's still a little dirty or you're leaning your torch back to far. When you clean your steel rub your finger over the joint before you do anything, and if you get grey on your finger it is still dirty.I hate being bi-polar it's awsomeMy Heroes Have Always Been Cowboys
Reply:@ BrooklynBravest - Aloha.  Try baselining your flow rate with GMAW @ 25 CFH.   Weldermike is also spot on.  BTW, what are your settings on the 0.125" wall tubing w/ the Hobart "210"?"Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:Are you using nozzle gel?  I started using it recently but I can't remember if I was getting the black soot before the nozzle gel.  The nozzle gel sure is saving me a lot of headaches with spatter on the nozzle but it seems to be a little drippy sometimes, especially when the nozzle is hot.  I am using the nozzle gel sparingly.Syncrowave 210HH140Victor O/A
Reply:Try this first........Leave gas set to 20, cause that is plenty. Seeing as how you got the 210MVP, then simply flip the inside switch to spool gun and depress torch trigger while you count to 5...This will purge all air out of hose and torch...switch back to mig and lite er up.As a Rule, always start with a short wire stickout, super solid ground, and use brite clean nozzle and electrode and cooking spray inside assembled nozzle....Also make sure electrode is shrouded by nozzle by about 1'8" depth.OOOOPS, that should read 1/8" depthLast edited by wornoutoldwelder; 11-20-2014 at 08:48 PM.Reason: syntax
Reply:ok il give it a shot thanks.Ive been running the machine at 12-15cfh indoors for a while always seemed fine.www.FirehouseFabricators.comZachLincoln 210mpLincoln SW200Hypertherm Powermax 45xp2x4 CNC Plasma Table.
Reply:bad gas
Reply:Originally Posted by TimmyTIGbad gas