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Limitations for use of 180 Amp Mig Welder ???

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  • Limitations for use of 180 Amp Mig Welder ???

    I am not new to welding however am planning a new welding project that is a first for me, and that demands respect because of loading requirements of the application.

    The project is fabrication of a hydraulic press frame wih an active load of 30 tons. Although I am skeptical of using one of my 220 volt milier 180 amp millermatic welders for this project it sure would be covenient for me if I could.

    So my question is - Is using a Mig welder for structural applications such as this press frame a fools errand ?

    When welding I always grind or brush the weld areas clean, and grind for penetration as preparation.

  • #2
    Mig is used in structural applications each and everyday. Many think stick is the only choice for load bearing weld mental which is just not true.

    What thickness steel?

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    • #3
      Originally posted by Cgotto6 View Post
      Mig is used in structural applications each and everyday. Many think stick is the only choice for load bearing weld mental which is just not true.

      What thickness steel?
      There are 1" thick elements that are to be welded to 1/4" thick tube. I figured a good preheat would be a compensation for the extra thicness. If so how much preheat is needed ?

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      • #4
        My Chinese made press that I inherited was made with mig. I don't for see any problems if done correctly.

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        • #5
          Originally posted by kize View Post
          My Chinese made press that I inherited was made with mig. I don't for see any problems if done correctly.
          "if done correctly" is the key here.

          knots43 -- I don't think you will get great penetration on 1" plate with your machine. I assume these welds will be in "shear"? No one here can tell you of your ability. I wouldn't trust it if it were mine. This is something that has the possibility of letting go violently under load with your head/body right next to it. Do you really want to be thinking about your welds every time you are maxing it out?
          MM250
          Trailblazer 250g
          22a feeder
          Lincoln ac/dc 225
          Victor O/A
          MM200 black face
          Whitney 30 ton hydraulic punch
          Lown 1/8x 36" power roller
          Arco roto-phase model M
          Vectrax 7x12 band saw
          Miller spectrum 875
          30a spoolgun w/wc-24
          Syncrowave 250
          RCCS-14

          Comment


          • #6
            Originally posted by knots43 View Post

            So my question is - Is using a Mig welder for structural applications such as this press frame a fools errand ?
            So how thick and what shape is your metal? I used my MM185 on my press and didn't have it maxed out...Bob
            Attached Files
            Bob Wright

            Spool Gun conversion. How To Do It. Below.
            http://www.millerwelds.com/resources...php?albumid=48

            Comment


            • #7
              Originally posted by MMW View Post
              "if done correctly" is the key here.

              knots43 -- I don't think you will get great penetration on 1" plate with your machine. I assume these welds will be in "shear"? No one here can tell you of your ability. I wouldn't trust it if it were mine. This is something that has the possibility of letting go violently under load with your head/body right next to it. Do you really want to be thinking about your welds every time you are maxing it out?
              Yours is the obvious answer. Maybe with preheating it could work but the problem with preheating a sizeable frame is that it cannot be pre-heated all at once. Local pre-heats would likely cause distortion. I agree that without pre-heating the 1" plate that the results would be questionable at best.

              For something this heavy about all I can rely on using the MIG would be tacking to get everything in alinement and set for the real welds.

              Anybody ever use a toaster oven for a rod oven ?

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              • #8
                Limitations for use of 180 Amp Mig Welder ???

                No mention of metal transfer, could be short arced. But, spray would be better. Get a cylinder of 98/2 ( argon oxygen or argon CO2 ).

                Comment


                • #9
                  I don't know if the 180 has enough power to get into spray. There are ways to do this but the op has limited experience, limited machine & all he needs is to make a few welds for himself. My advice would be for him to tack it up & let someone with a larger machine weld it. No one here has even seen the design yet so saying it is o/k is irresponsible.

                  It may be fine forever but it only takes once when something lets go.
                  MM250
                  Trailblazer 250g
                  22a feeder
                  Lincoln ac/dc 225
                  Victor O/A
                  MM200 black face
                  Whitney 30 ton hydraulic punch
                  Lown 1/8x 36" power roller
                  Arco roto-phase model M
                  Vectrax 7x12 band saw
                  Miller spectrum 875
                  30a spoolgun w/wc-24
                  Syncrowave 250
                  RCCS-14

                  Comment


                  • #10
                    Limitations for use of 180 Amp Mig Welder ???

                    I believe 0.035 ER70S-6 wire will transition to spray at 24.5 + volts with a 90% + argon bi-mix shielding gas at 160 amps. May bump the duty cycle hard.

                    Comment


                    • #11
                      Originally posted by knots43 View Post
                      I am not new to welding however I am skeptical of using one of my 220 volt milier 180 amp millermatic welders for this project it sure would be covenient for me if I could.
                      Does this mean you have access to another welding machine besides the MM180? What other welding machine may you have available to use for this?

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