Function of Iron Oxide in MMA Flux?

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What is the function of iron oxide in MMA flux?AWS examples are 6019, 6020, 6027 and 7027 but I don't think I have come across them before.ISO 2560 does not list iron oxide.ThanksJack
Reply:High deposition rate in the flat position. Not used a lot these days.
Reply:

Originally Posted by Woznme

High deposition rate in the flat position. Not used a lot these days.
Reply:I agree 👍 Mig replace need for that type of rods.Dave

Originally Posted by Jack Ryan

What is the function of iron oxide in MMA flux?AWS examples are 6019, 6020, 6027 and 7027 but I don't think I have come across them before.ISO 2560 does not list iron oxide.ThanksJack
Reply:Not sure but it would have to be good flux to keep the oxygen from the iron oxide out of the weld pool, so there's that.
Reply:I had a book copyright in the 1950's. It gave a why use some of odds rods like 6019, 6020, 6027 and 7027. Also the types of fluxs.Dave

Originally Posted by Jack Ryan

What is the function of iron oxide in MMA flux?AWS examples are 6019, 6020, 6027 and 7027 but I don't think I have come across them before.ISO 2560 does not list iron oxide.ThanksJack
Reply:

Originally Posted by Woznme

High deposition rate in the flat position. Not used a lot these days.
Reply:

Originally Posted by Jack Ryan

What is the function of iron oxide in MMA flux?AWS examples are 6019, 6020, 6027 and 7027 but I don't think I have come across them before.ISO 2560 does not list iron oxide.ThanksJack
Reply:

Originally Posted by Oldiron2

I've never heard of, or at least never noticed the 6019 designation. All the others are listed in various books I have. I might even have a few 6027 rods somewhere. As for the purpose, I can think of two possible reasons. 1). It could combine with other, perhaps calcium, magnesium or silicon, compounds present to harden as a stable but friable flux coating, and the oxygen might be removed by carbon also present, thereby giving CO (and ultimately CO2) shielding gas. In the early days of engine designs, lots of interesting but not successful ideas were used for ignition systems, valve operation, and cooling (e.g. the eight -stroke Aeromotor). I suppose that's equally true of welding development. 2). If aluminum or magnesium powder were present, they would undergo a Goldschmidt [Thermite] reaction to produce molten iron, Al. or Mg. oxide, and lots of extra heat. Such rods might have particular use for underwater cutting or welding where the extra heat is needed; for the first use, the electrode could also be hollow so air would help blow the molten metal away and create an insulating air envelope. This one would be my guess.
Reply:I haven't seen any reference to 2) but 1) is one of the reasons it was used. See my last post for a reference.
Reply:

Originally Posted by Jack Ryan

What is the function of iron oxide in MMA flux?AWS examples are 6019, 6020, 6027 and 7027 but I don't think I have come across them before.ISO 2560 does not list iron oxide.ThanksJack
Reply:

Originally Posted by Thoriated Wolfram

Per the electrode classification system, only Exxx7 and Exxx9 electrodes should have iron oxide specifically in their fluxes. It's possible a manufacturer tried to add iron oxide to a Exxx0 electrode but it doesn't appear that's a standard thing to do (at least not in any great quantity).Exxx0 is a cellulose, sodium coating - the difference between E6020 and E6010 is that of deposition rates and which positions you can use the rod in. E6020 is flat, horizontal and E6010 is all positions. Exxx7 is a basic, iron powder, iron oxide coatingExxx9 is a rutile, iron oxide, potassium coating