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Steel filler rods - can you tell if its ER70S-2 vs. -6? How about vs RG45?

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  • Steel filler rods - can you tell if its ER70S-2 vs. -6? How about vs RG45?

    Well, I found a tube of 10 lbs of steel 1/32 filler. It has a light copper coat.

    Of course, the tube is not labeled. My fault.

    I'm pretty sure its ER70S-2. I just can't remember why it wasn't labeled. I have sharpies all over the place. I do have a tube of RG45. I even have a tubes of ER70S-6.

    The problem is the ER70S-2 is what I use on critical stuff like roll cages. I think I just answered my own question. Toss it (maybe put it in with the RG45).

    Call it spring cleaning... <sigh>
    Con Fuse!
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  • #2
    Are the rods not stamped on the ends?

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    • #3
      Try running some, in my experience it won't take long to tell. Oxy Acetylene filler rods don't wet out nicely with tig and will tend to give you pin holes and small bubbles on all but the cleanest steal. Worth a try, in my opinion.
      Owner of Burnt Beard Fabrication & Welding Ltd.

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      • #4
        Rg-45

        Originally posted by con_fuse9 View Post
        Well, I found a tube of 10 lbs of steel 1/32 filler. It has a light copper coat.

        Of course, the tube is not labeled. My fault.

        I'm pretty sure its ER70S-2. I just can't remember why it wasn't labeled. I have sharpies all over the place. I do have a tube of RG45. I even have a tubes of ER70S-6.

        The problem is the ER70S-2 is what I use on critical stuff like roll cages. I think I just answered my own question. Toss it (maybe put it in with the RG45).

        Call it spring cleaning... <sigh>
        If they're not marked, more than likely it's a tube of RG-45 (gas welding) rods. Some R-45 rods are stamped (Harris, I believe) but are clearly marked "R-45"

        TIG rods are stamped at both ends (R70S-2 1/16, R70S-6 3/32), etc
        "Bonne journe'e mes amis"

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        • #5
          Sometimes 1/32 (or .035) filler rod is actually made from MIG spools. They straighten and cut. They don't bother stamping.

          I know my .035 308L and 309L don't have any markings. (Washington Alloys). The 1/16 does.

          What happens if you try to weld ER70 with O/A?
          Con Fuse!
          Miller Dynasty 350
          Millermatic 350P
          -Spoolmatic 30A

          Hypertherm PowerMax 1000G3
          Miller Multimatic 200 - awesome portable MIG (and stick and TIG)
          Miller Maxstar 200DX - portable TIG and stick

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          • #6
            All of the O/A welding I've done has been with ER70S6. I'm no expert at O/A welding. I was just practicing and all I had around was tig filler. It welds fine, but I don't have enough experience to know if the correct rod would work better.

            Dynasty200DX w/coolmate1
            MM210
            MM Vintage
            Lincoln AC225
            Victor O/A, Smith AW1A
            Cutmaster 81
            IR 2475N7.5FP
            Evolution Rage3
            Jancy USA101
            9" South Bend
            AEAD-200LE

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            • #7
              Not all tig filler rods are stammped for ID markings.
              Some manufacturers sell unstamped rods at reduced prices compared to stamped rods.
              If you run the rods you should know what they are in short order. 70S2 will have a very slugish puddle for easy out of position work. 70S6 will have a much more fluid and wetter puddle.
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