Oily weld after cooling

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Hi all, so lately I’ve been doing some structural welding (I-beams/Tubing), and have ran into an issue and can’t figure it out. I clean my steel and preheat before welding but after the bead cools down for some hours it seems an oily residue develops around the edges of my bead. I’ve processed quite a few beams already and am really hoping this isn’t a major issue. Currently I am running dual shielded flux core (DiamondSpark 52-RC) (30V/450 wire speed) (Argon/Co2). I’ve never seen this happen before until I started doing dual shield. Any suggestions would be extremely helpful.
Reply:That's odd, with the preheat and heat created by welding you would think it would burn anything and everything out. Have you tried doing the same welds with a different process like stick or self shielded flux core? Could it be something on the wire itself?NRA LIFE MEMBERUNITWELD 175 AMP 3 IN1 DCMIDSTATES 300 AMP AC MACHINELET'S GO BRANDON!"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” BENJAMIN FRANKLIN
Reply:We used to buy HRPO steel sheet (hot rolled, pickled, and oiled)In trying to make sure we complied with some military contract, we investigated what the "OIL" was,,(The contract required that the oil was not petroleum based)When we finally tracked it down, the oil came from a Chicago slaughter house,, it was rendered fat.Apparently, that was OK per the contract we were working to.Does the weld smell like bacon, or cooked hamburger?? You may have the same thing.The heat of the weld would "chase" away the oil, and it will build up to where you could see it.
Reply:Only time, that I can remember, having oily stuff around a weld is when I weld tubing that comes in from Mexico.  They slather it in waste oil so that it doesn't rust on the ship, and barges that bring it up river.  Only thing, if I care to take the time, that works is mineral spirits or brake cleaner.  Otherwise, if you just wipe it with a rag, the oil will show up around the weld.The oil burns off inside/under the weld, but then you're defeating the lo-hy nature of your filler.