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3G Open Root Help Please

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  • 3G Open Root Help Please

    Hey Guys, I am currently working on my 3 G (1/8 land, 3/32 gap, 6010 1/8 root and hot) 7018 1/8 cap I keep getting a bit of undercut on my cap , ive tried slowing down and pausing more on the edges .. .... my question is what exactly does the inductance control do, I have it at 50% ? ! ? any advice or tips I can get rid of the undercut if i run colder but i want it to be a tight cap, I am running it at 124 amps on my cap. Thanx for any tips fellas!

  • #2
    Inductance makes constant current more constant.

    Simply put, it makes it dig. It affects the arc force. It varies the arc from soft and shallow to crisp and deep. If you're getting undercut adjust it to get a softer arc. Or keep it at 50% and lower your current a little if you can. Softer arc is easier to lose though.

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    • #3
      So when you say a softer arc , that would mean lower the inductance or increase it? thank you very much for your help

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      • #4
        How are you determining the amperage you are welding at?

        At that amperage (if it's accurate) you should be easily able to cap without undercut.

        Is your material very thin? If so you might need to let it cool off some before you cap it.

        If all else fails you need to turn the machine down. There's no reason to have undercut on a LoHi cap, it will fill everything it digs out and then some.

        JTMcC.
        Some days you eat the bear. And some days the bear eats you.

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        • #5
          3G Open Root

          It's 3/8 Plate i forgot to mention that, and its a newer miller inverter. It can be adjusted to the amp. I really want to know more about this remote dig/inductance dial. What i gather is more inductance equals a smoother volt-ampere curve which changes in arc length dont affect the current/amps as much as a lower setting would........

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          • #6
            If it's that thin, let it cool off a while before you cap it.

            Don't get hung up on the additional knobs, you should be able to cap that thing with that knob maxed out or zeroed out.

            JTMcC.
            Some days you eat the bear. And some days the bear eats you.

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            • #7
              3G Passed!

              Hey Jt! Thankyou for all your help, when it came down to it the problem was me and lack of patience . . I stopped 2X on the cap approx every 2 inches and I passed both the visual and the bend test , I also dropped my amps to 120. All good next up is my 3G Downhand 6010! I willl keep you posted Thanks Again for the advice.. oh i almost forgot i turned my inductance up to 70% as well . The weld was beautiful.

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              • #8
                Congratulations.

                Another important variable concerning the cap is how you fill the joint. If you leave it low, you have to carry more iron on the cap and that means slower travel and usually less heat, and if it's too low you won't be able to fill it perfectly and the result is a bit of undercut or missed bevel.
                If you fill it up more before capping you will carry a lot less iron on the capoand have to move quite a bit faster and run more heat.

                One of the most important things in spraying on a slick cap is filling "just right", It makes the cap much easier.


                JTMcC.
                Some days you eat the bear. And some days the bear eats you.

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                • #9
                  Also if the last filler before the cap has a convex, humped up profile, you'll have a crevise at the edge of the bevel. A little of that bevel showing makes it easier to see the sides but too much is an invitation to trap slag or have a small lof problem.
                  If the last filler is too concave or dished in, you can have a hard time depositing enough iron in the middle to have a nice convex, higher than the pipe, cap.
                  Some guys will completely catch the bevel edges with the last filler, that way
                  they really can't miss an edge on the cap.
                  Like my old buddy GRT says, a cap is like a house, if the foundation isn't solid the whole thing is junk.

                  JTMcC.
                  Some days you eat the bear. And some days the bear eats you.

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                  • #10
                    back-up for horizontal/vertical

                    i dont know if yyour welding vertical w/mig but i would not recomend it , tig,stick,flux-core yes , you should ask your instructor about ceramic back-up strips, elimates a backing plate completely. go to www.cerbaco.com, there out of nj.

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                    • #11
                      Originally posted by flux-core View Post
                      i dont know if yyour welding vertical w/mig but i would not recomend it , tig,stick,flux-core yes , you should ask your instructor about ceramic back-up strips, elimates a backing plate completely. go to www.cerbaco.com, there out of nj.
                      Why not with solid wire? People do it every day, you just have to set your machine correctly.

                      Oh yeah and if you read his post:

                      "3 G (1/8 land, 3/32 gap, 6010 1/8 root and hot) 7018 1/8 cap"

                      But the backing strips you linked to look pretty cool!
                      Last edited by c wagner; 09-20-2008, 03:33 PM. Reason: added more info
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                      • #12
                        Lol

                        That was completely off topic , lol read the first post , and as wagner said it can and is done quite often with hard wire and that is also done on pipe as i have to do too hardwire is very effective in the hands of a skilled welder you can even weld an open root downhand with hardwire its all about learning... backing strips are used mostly at beginner levels of welding, ex: CWB . . . . TIG is my preference for root passes on pipe. Then you fill er up with rod. just my opinion ,
                        Last edited by BC_Hardwire; 09-25-2008, 06:09 PM.

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                        • #13
                          I believe that was a spam post.
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                          • #14
                            3G Vertical Upwards Progression
                            Vertical Downwards Progression

                            can't you just use 3/32 7018 at 82amps and run a file down the edge?
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                            • #15
                              Originally posted by flux-core View Post
                              i dont know if yyour welding vertical w/mig but i would not recomend it , tig,stick,flux-core yes , you should ask your instructor about ceramic back-up strips, elimates a backing plate completely. go to www.cerbaco.com, there out of nj.
                              doesn't look like they want to sell to students.

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