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Need tips from welding experts
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downwardspiral



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Shooter

    Post: #1
    Need tips from welding experts

    Hey guys, I am going to be welding a competition engineering sump onto a new stock style gas tank with a lincoln 140 mig welder. Are there any tricks to doing it or is it just like welding regular sheet metal?
    Offline 08-01-2010 04:29 PM
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    rocketfoot


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    Car of the Month Trophy Shooter Mustang Award

      Post: #2
      RE: Need tips from welding experts

      I can't help you much! We just got a Miller Mig and I'm still watching the instructional video...LOL! My Dad can well pretty good though, so I'm safe for now!
      Offline 08-01-2010 08:05 PM
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      droptop73


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        Post: #3
        RE: Need tips from welding experts

        You'll probably want to tig weld it. Better heat control and less porosity. IMHO
        Offline 08-02-2010 07:55 AM
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        machman_73



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          Post: #4
          RE: Need tips from welding experts

          Tig would be the best but you could probably use mig. I would test the heat on similar metal. I assume your cutting the hole in the tank slightly smaller than the sump so that you have double thickness of metal to weld to. Not edge to edge. I would tack it in several places. Middle,corners. Good tacks. If they stick up hit with grinder. I would start maybe the middle bottom tack and go to the right corner stop. then top middle tack and go to the left corner and so on. Staggered pattern to keep the heat down. MB I just looked at mine. With the ribs in the fuel tank may make it tough. A flat surface would be much easier.
          (This post was last modified: 08-02-2010 07:46 PM by machman_73.)
          Offline 08-02-2010 07:24 PM
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          downwardspiral



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          Shooter

            Post: #5
            RE: Need tips from welding experts

            (08-02-2010 07:24 PM)machman_73 Wrote:  Tig would be the best but you could probably use mig. I would test the heat on similar metal. I assume your cutting the hole in the tank slightly smaller than the sump so that you have double thickness of metal to weld to. Not edge to edge. I would tack it in several places. Middle,corners. Good tacks. If they stick up hit with grinder. I would start maybe the middle bottom tack and go to the right corner stop. then top middle tack and go to the left corner and so on. Staggered pattern to keep the heat down. MB I just looked at mine. With the ribs in the fuel tank may make it tough. A flat surface would be much easier.

            The way I've seen it done is to drill several holes in the tank with a holesaw and trim the sump to fit the tank. http://www.hotrod.com/howto/70438_gas_ta...to_10.html
            I'm thinking of just doing everything up to tacking it up, then having someone weld it on with a TIG. I'm going to call a local shop to get a price on having it done. Thanks
            Offline 08-03-2010 04:42 PM
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            machman_73



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              Post: #6
              RE: Need tips from welding experts

              (08-03-2010 04:42 PM)downwardspiral Wrote:  
              (08-02-2010 07:24 PM)machman_73 Wrote:  Tig would be the best but you could probably use mig. I would test the heat on similar metal. I assume your cutting the hole in the tank slightly smaller than the sump so that you have double thickness of metal to weld to. Not edge to edge. I would tack it in several places. Middle,corners. Good tacks. If they stick up hit with grinder. I would start maybe the middle bottom tack and go to the right corner stop. then top middle tack and go to the left corner and so on. Staggered pattern to keep the heat down. MB I just looked at mine. With the ribs in the fuel tank may make it tough. A flat surface would be much easier.

              The way I've seen it done is to drill several holes in the tank with a holesaw and trim the sump to fit the tank. http://www.hotrod.com/howto/70438_gas_ta...to_10.html
              I'm thinking of just doing everything up to tacking it up, then having someone weld it on with a TIG. I'm going to call a local shop to get a price on having it done. Thanks
              That would be the best bet. Checked out some of that link. Looked like some good info. machman.
              Offline 08-03-2010 04:50 PM
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              72fastback



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                Post: #7
                RE: Need tips from welding experts

                Your mig should be fine .The first rule of welding is {practice practice practice} Like machman says try your hand on similar gauged steel.When you get a good setting tack it real good and only do small welds do not try to weld it all at once.You can use a wet rag to help cool the steel quicker.And again I agree with machman to cut the hole in the tank a little smaller the extra thickness will help alot.
                Offline 08-03-2010 04:55 PM
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                69 Rustang



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                  Post: #8
                  RE: Need tips from welding experts

                  Is the tank galvanized? If so, you have to remove the galvanizing from the area to be welded.
                  Offline 08-09-2010 12:07 AM
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                  Tomahawk715



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                    Post: #9
                    RE: Need tips from welding experts

                    (08-09-2010 12:07 AM)69 Rustang Wrote:  Is the tank galvanized? If so, you have to remove the galvanizing from the area to be welded.

                    Very good point there--If you dont you will have all kinds of splatter and possibly a huge headache--ask me how I know Dodgy
                    Offline 08-16-2010 02:14 AM
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                      Post: #10
                      RE: Need tips from welding experts

                      One thing that I need to know from the welding expert was to know more on the operating modes and their characteristic into the part of welding. It could be great to know the classification of all operating modes, just like for the plasma welding. I think that it was a good challenge to have more scrapped welding.
                      10-18-2010 02:50 AM
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