metal core wire

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This is new to us. We were given a procedure that called for .062 metal core wire. Set up some test ran the wire flat and horizontal just could not get the results we are use to with dual shield flux core.75/ 25 shielding gas mild steel plateWe ran it from 236 amps up to 350 it penetrated great but the apperence was poor. I don't recall the exact wire speed or voltage but it was any where from a spray mode to a globular transfer and would undercut very easily.ThanksMiller 330 A/BP Bernard SS coolerMiller cst 250Miller Big Blue 251DCentury 210 Mig (first welder I bought)Hypertherm PowerMax 800Victor torch setRu Fong 31 MilAtlas lathe
Reply:I used to run a lot of .052 metal core...  Your amperages are up there ok  Metal core likes a tri mix or one of the custom high argon mixes.  With 25 percent carbon dioxide I doubt that you can get into a proper spray and benefit from using metal core.   We were running 27 to 28.5 volts.  It produces a big puddle.  I ran straight on with no lead or drag.  Often I would do a whip forward and back to elongate the puddle and maintain control.  On rusty metal the metal core we ran did not cooperate and you needed to burn ahead and back to give it time to float the impurities out.  The worst was accidental porosity.  The holes went right down to the bottom of the bead so you had to gouge or spend a long time grinding.
Reply:....or one of the custom high argon mixes
Reply:I use 92/8 and its the balls with metal core.  Its the nicest smoothest quietest spray.  Little smoke.Try it.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:thanksWe have some tri mix for SS (mig) will it work.Miller 330 A/BP Bernard SS coolerMiller cst 250Miller Big Blue 251DCentury 210 Mig (first welder I bought)Hypertherm PowerMax 800Victor torch setRu Fong 31 MilAtlas lathe
Reply:If you were trying to run it horizontal thats probably part of your problem, metal core likes to stay flat.  But I agree that using C25 is probably your biggest issue, not high enough argon content.  95/5 or 98/2 will do you good.Have we all gone mad?
Reply:You (or I) can run it up hill with pulsed spray.David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by toolmanthanksWe have some tri mix for SS (mig) will it work.