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c25 or straight co2

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  • #31
    cope and alex,

    I have not tried to spray with a MM251 with C25. I kinda doubt it has the top end. I was barely to get the axial spray with .035" bare wire at 36 volts pushing 400 amps. You might try with .030" wire. Let me know.

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    • #32
      Here is the Smith gas mixer:
      http://www.smithequipment.com/produc...r/gasmixer.htm

      Comment


      • #33
        Originally posted by hankj
        Weldmup,

        Huh? Spray can only be accomplished in an argon-rich atmosphere?

        Bigwelder,

        I agree to a point, but as long as I stayed inside the parameters of the MM135, there was no spatter to speak of. If I treid to go where no man has gone before, BAD juju!

        Hank
        i switched jobs so now i use c25 at work and it works wonders on 18 gauge steel
        to weld or not to weld that is the question

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        • #34
          Originally posted by HAWK
          cope and alex,

          I have not tried to spray with a MM251 with C25. I kinda doubt it has the top end. I was barely to get the axial spray with .035" bare wire at 36 volts pushing 400 amps. You might try with .030" wire. Let me know.
          Hawk,

          It may not, and at any rate it would definately not be the mix of choice. I just meant to point out to neighbor Alex that Spray was possible with C-25.

          Comment


          • #35
            Originally posted by HAWK
            Rocky D,

            Do you have link to the Smith Gas mixer you used or use at work?
            This is it, Hawk..runs about $1100

            http://www.smithequipment.com/produc...dardtwogas.jpg
            Arcin' and Sparkin', Rocky D

            "Experience is the name we give our mistakes"

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            • #36
              RE:gas mixer

              Originally posted by Mike W
              Welcome Captbob! I am putting together one along the lines of this one: http://www.star.bnl.gov/STAR/pmd/sta...as_system.html
              Looks like the mixer is metric. Have to get out the conversion tables.
              I didn't see where the parts were purchased. Can you help me out here.
              PS This is a new frontier for me, so my replies may not be timely. (Too many moving parts!) Guess I'm better at welding than computers
              SO, having said that, I look forward to trying to build a mixer.
              Thanks. Capt Bob

              Comment


              • #37
                CaptBob, you might look around on ebay to see if any are available. Basically, I am using the flow meters on the cylinders to set the ratio. I go thru check valves to a mixing chamber. I have a flow meter at the output. For some reason it reads too high. I am in the process of fiquring out why.

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                • #38
                  Originally posted by Mike W
                  -snip- For some reason it reads too high. I am in the process of fiquring out why.

                  just thinking out loud:
                  turbulence/ambient temp-->>
                  increased gas temp-->>
                  increased gas volume-->>
                  increased flow rate?

                  If you had a single gas with a flow meter, then check valve, then a heating chamber, then another flow meter, it makes sense to me that the second flow meter would read higher than the first.

                  Ben

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                  • #39
                    I do very little mig exept for tacking and expanded metal

                    My dist dropped of a small tank of "stargon" whats every bodys thought on it? to me it ran hotter than the 75/25,,and was told it was alot cheaper? like I said use the mig for tacking and expanded metal guards,etc, use alot of 7024 Jet, all 1/4 "plate tanks,,,never looked on the label of what stargon was made of? anybody else use it on a reg. basis?Thanks, Jack

                    Comment


                    • #40
                      storts,

                      Hey Jack,

                      Glad to see you around the forum. Welcome! I have never welded with PRAXAIR'S STARGON. However, here is an excerpt from their website regarding argon, CO2, and O2 mixtures.

                      Argon-Carbon Dioxide-Oxygen Mixtures -- Praxair's Stargon® CS and RoboStar® CS Blends
                      Stargon® CS Gas Blend
                      Mixtures containing these three components are versatile, due to their ability to operate using short-circuiting, globular, spray, pulsed, and high-density transfer modes. Several ternary compositions are available and their application depends on the desired metal transfer mode.

                      The advantage of this blend is its ability to shield carbon steel and low-alloy steel of all thicknesses using any metal transfer mode applicable. Praxair's Stargon CS produces good welding characteristics and mechanical properties on carbon low-alloy steels and some stainless steels. On thin gauge base metals, the oxygen constituent assists arc stability at very low current levels (30 to 60 amps) permitting the arc to be kept short and controllable. This helps minimize excessive melt-through and distortion by lowering the total heat input into the weld zone. Stargon is generally used for spray arc welding, providing high deposition rates and often higher travel speeds than carbon dioxide.

                      RoboStar® CS Gas Blend
                      The carbon dioxide and oxygen levels in Praxair's RoboStar CS blend are balanced to produce excellent arc stability and arc performance in demanding automatic and robotic applications. High quality welds at higher levels of productivity are produced with this shielding gas mixture. The RoboStar CS blend will help to develop excellent weld metal strength and toughness as well as improved fatigue strength in a number of application areas.

                      Check out PRAXAIR'S WEBSITE

                      If you are doing a lot of tacking, maybe the STARGON would be beneficial.

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                      • #41
                        I used Airgas version. The weld really wets out but you have to get use to the sound of the arc. It sounds a little like welding with tri-mix. You are welding along and it sounds like crap, but when you look at the finished bead it really looks pretty nice. Different for sure. I also used some other mixes that had different % of the same gases. They do spray pretty nice too.

                        Comment


                        • #42
                          Originally posted by storts
                          My dist dropped of a small tank of "stargon" whats every bodys thought on it? to me it ran hotter than the 75/25,,and was told it was alot cheaper? like I said use the mig for tacking and expanded metal guards,etc, use alot of 7024 Jet, all 1/4 "plate tanks,,,never looked on the label of what stargon was made of? anybody else use it on a reg. basis?Thanks, Jack
                          Dang Jack,

                          Maybe instead of getting the SP 175+ you should have gotten yourself a MM 251 or PM 255 so that you could spray arc this 1/4" plate instead of having to deal with the slag and continuos rod changing of 7024. Oh well, I guess it isn t to bad, after all if you get the current set right, the slag just peels right off behind you as your welding. 7024 is the rod that they started us off on back in 1988 when i went to welding school, it is definitely one of my favorite rods to run. Didn t like it much at first though, because they had us running it on DC+ at the start so that we could learn how to deal with arc blow.

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                          • #43
                            We used the jet rods on skid fab. back in early '60's. Tis good for horizontal welds, can lay down some kind of beads, gota love 'um. they did bring in a mig w/large wire, don't remember the size, but didn't pan out.
                            I had a project a short time back, purchased a box of 5/32" jets, dang near smoked my machine due to not watching the duty but lovin that bead, LOL

                            As I remember it, when I purchased my mig from the Linde dealer where my bride was employed, Joe the welding procedures guy suggested for autobody work that Stargon would weld cooler that C25, however I never did try it.

                            I think Andy suggested C25 is best for light matl., that st. CO2 would not be necessary since there is not a penetration issue.

                            Good day all,
                            L*S

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                            • #44
                              10-4 Leons.

                              Unless you are doing heavy wall or thick weldments where you are not spraying or pulse spraying and you can deal with the spatter then Co2. I prefer C25 and only use the Co2 for doing I-beam tongues on all these landscaping trailers that come in bent all to ****.

                              Andy

                              Comment


                              • #45
                                Originally posted by ASKANDY
                                10-4 Leons.

                                Unless you are doing heavy wall or thick weldments where you are not spraying or pulse spraying and you can deal with the spatter then Co2. I prefer C25 and only use the Co2 for doing I-beam tongues on all these landscaping trailers that come in bent all to ****.

                                Andy
                                What Spatter? I use a Passport on CO2.

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