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Large sheet butt weld on Aluminum

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  • Large sheet butt weld on Aluminum

    First just learning to mig aluminum with Miller 211 and spool gun
    been playing a lot with settings and
    stuff. I have a goal of building a boat! 1/8" sheet
    will have all kinds of welds on it but the first may half to be a but weld on the bottom! About 56" long. The pieces are 8' long
    first how do you do it without it warping all over the place. And then
    in testing but welds I get lots of bead on the back of the
    plate I expect to have to weld both sides of it so am I welding to hot
    in the first place? Jumping back
    and forth with short arc and spray
    transfer at least what I consider it is.
    Along with this I get tons of burn through showing on the back of test plate
    what is the secret to not burning through so
    much. Thanks

  • #2
    1/8 plate you should really be using a pulse machine, with that unit your going to have to make alot of spot and short 1" welds with no more than 030 4043 wire, Argon at 15CFH, gun pushing at an angle to the work, NOT straight on, and ALL spray arc

    Comment


    • #3
      I weld aluminum all the time with this machine here are my settings. Wire speed is at 90-91 & temp set at 6. I also recommend swapping tips to the ones used on your mig gun . With 030 wire 4043
      .
      Miller Bobcat 225NT onan
      Millermatic 211
      Spoolmate 100
      (Retapped to fit regular mig tips)
      Work better & less parts to stock.
      Miller 130xp
      T/A Dragster 85 (portability 11 pounds)
      Oxygen/Acetylene torch set 50'
      2. 4-1/2" grinders
      1. 9" grinder
      14" Makita chop saw
      1/2" Aircat impact gun 900#

      Comment


      • #4
        Originally posted by fishbum View Post
        First just learning to mig aluminum with Miller 211 and spool gun
        been playing a lot with settings and
        stuff. I have a goal of building a boat! 1/8" sheet
        will have all kinds of welds on it but the first may half to be a but weld on the bottom! About 56" long. The pieces are 8' long
        first how do you do it without it warping all over the place. And then
        in testing but welds I get lots of bead on the back of the
        plate I expect to have to weld both sides of it so am I welding to hot
        in the first place? Jumping back
        and forth with short arc and spray
        transfer at least what I consider it is.
        Along with this I get tons of burn through showing on the back of test plate
        what is the secret to not burning through so
        much. Thanks
        Seems to me you bettar buy about 30 cans of flex seal because that boat is going to leak! Every time you stop and start is a very cold weld on aluminum, this is very bad on a boat. Also the stringers of the boat should be installed before seam welding the bottom. Making an aluminum boat from scratch is not an easy task, a pulse welder makes it much easier.
        kevin
        Lincoln ranger 305g x2
        Ln25
        Miller spectrum 625
        Miller 30a spoolgun
        Wc115a
        Lincoln 210mp
        F550 imt service truck

        Comment


        • #5
          Post up a pic of your design. Try to design, and build with as few pieces as possible, fewer seams. Grind your stops before you restart. If possible a different joint design rather than a butt weld. Try to incorporate structural stringers into the design as well, as this makes a good place to weld to without long butt welds. Look at commercial designs to see how theirs are made.

          Comment


          • #6
            Boat

            Wow, guess I will opt for one piece bottom! Or just buy another hull.
            I have bought several from a small custom builder and I know they use pulse mig
            but can't see anyone doing 18' without stopping? Eecrvantes83. That seem real hot on your 211 settings. I'm still learning but right now I'm around 4.5 and 6 on wire. I guess I should ck forum for this but how the heck do you cut back the Cratering at end of weld! Thanks

            Comment


            • #7
              Building a boat with a 211 is limited in my opinion. Its a small hobbyist machine that lends itself more to small aluminum projects, however it can be done. I would compare it to framing up a house with a tack hammer compared to using a framing nailer or nail gun. Both get the job done, but you limit yourself with the underpowered option. You may not be satisfied with the end result, which may result in time and material wasted.

              However, good luck with your project and remember, you may be trusting your project with your life and the life of others who use it. Open up a seem in rough open water and your in trouble.

              If I would build a boat, I would purchase a pre-crimped hull and just finish the inside. Outcome would be safer and nicer and would still be a great project to enjoy building.

              Ja
              sigpic

              Dynasty 200 DX
              Millermatic 350P
              30A Spoolgun
              Lincoln Pro Mig 140
              Hypertherm Powermax 30
              14" Rage Evolution dry saw
              40 ton press brake
              Evenheat Heat treat oven

              1x42 / 4x48 belt grinder

              Comment


              • #8
                The crater at the end of the weld is covered with at tack right after the weld bead is done . I mean in a split second.
                .
                Miller Bobcat 225NT onan
                Millermatic 211
                Spoolmate 100
                (Retapped to fit regular mig tips)
                Work better & less parts to stock.
                Miller 130xp
                T/A Dragster 85 (portability 11 pounds)
                Oxygen/Acetylene torch set 50'
                2. 4-1/2" grinders
                1. 9" grinder
                14" Makita chop saw
                1/2" Aircat impact gun 900#

                Comment


                • #9
                  This machine is no hobby welder under the right hands this machine can handle large difficult jobs easy. I'd post up pictures of some jobs and welds but my mobile app is giving me problems posting.
                  .
                  Miller Bobcat 225NT onan
                  Millermatic 211
                  Spoolmate 100
                  (Retapped to fit regular mig tips)
                  Work better & less parts to stock.
                  Miller 130xp
                  T/A Dragster 85 (portability 11 pounds)
                  Oxygen/Acetylene torch set 50'
                  2. 4-1/2" grinders
                  1. 9" grinder
                  14" Makita chop saw
                  1/2" Aircat impact gun 900#

                  Comment


                  • #10
                    Mig crater

                    Originally posted by eecervantes83 View Post
                    The crater at the end of the weld is covered with at tack right after the weld bead is done . I mean in a split second.
                    Thanks I will try that. Any video out there that showed that? Again the numbers
                    you stated on your 211. 6 and 9 on wire are you on 120? Also what difference will I see again with 1/8 switching from
                    .30 wire to .35. ? A guy I know built a boat for the first time and a miller rep had him change from .30 to .35. Had less trouble overall !

                    Comment


                    • #11
                      I dont think I ran 035 wire before. My supplier had 030 & that's what I stuck with. I only weld aluminum on 220.
                      Last edited by eecervantes83; 08-26-2014, 01:29 PM.
                      .
                      Miller Bobcat 225NT onan
                      Millermatic 211
                      Spoolmate 100
                      (Retapped to fit regular mig tips)
                      Work better & less parts to stock.
                      Miller 130xp
                      T/A Dragster 85 (portability 11 pounds)
                      Oxygen/Acetylene torch set 50'
                      2. 4-1/2" grinders
                      1. 9" grinder
                      14" Makita chop saw
                      1/2" Aircat impact gun 900#

                      Comment


                      • #12
                        Originally posted by eecervantes83 View Post
                        This machine is no hobby welder under the right hands this machine can handle large difficult jobs easy. I'd post up pictures of some jobs and welds but my mobile app is giving me problems posting.
                        I know that its my opinion, but lets face it, you will not find this machine in an aluminum boat fabricating shop. In my mind, that means hobbyist as opposed to manufacturer/fabricator based upon its limitations.
                        Last edited by ja baudin; 08-26-2014, 03:21 PM.
                        sigpic

                        Dynasty 200 DX
                        Millermatic 350P
                        30A Spoolgun
                        Lincoln Pro Mig 140
                        Hypertherm Powermax 30
                        14" Rage Evolution dry saw
                        40 ton press brake
                        Evenheat Heat treat oven

                        1x42 / 4x48 belt grinder

                        Comment


                        • #13
                          He ain't building for a profit and he ain't building for production. It might take him a bit longer and use a different (technique?). But its doable and its been done before. Plus it will give the operator time to master the spoolgun.
                          .
                          Miller Bobcat 225NT onan
                          Millermatic 211
                          Spoolmate 100
                          (Retapped to fit regular mig tips)
                          Work better & less parts to stock.
                          Miller 130xp
                          T/A Dragster 85 (portability 11 pounds)
                          Oxygen/Acetylene torch set 50'
                          2. 4-1/2" grinders
                          1. 9" grinder
                          14" Makita chop saw
                          1/2" Aircat impact gun 900#

                          Comment


                          • #14
                            Might give this thread a little bump... I wonder what the status is of this boat build...?

                            Comment


                            • #15
                              Here is some good information on aluminum boat building.

                              http://weldingweb.com/showthread.php...num+boat+build

                              http://weldingweb.com/showthread.php...num+boat+build
                              Last edited by kiwi; 09-27-2014, 08:06 PM.

                              Comment

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