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  1. #1
    Join Date
    Nov 2006
    Posts
    7

    Default Car Rottiserie - Welding Advice Plz

    Been welding for about 10yrs, currently using Miller 175, though haven't tackled anything of this magnitude. Most of the steel tube is 3/16 wall and I'm fairly comfortable with the MM175 at this thickness. Plan to use .035 wire and 75/25 mix.

    There are some 1/2in gussets, however, so I'm thinking those will definitely need multiple passes. Also will probably do multiple passes on all the high stress joints regardless of thickness. Can someone pls describe the procedure for multiple pass welding, for example, welding 1/2 plate to 3/16 wall tube.

  2. #2
    danno Guest

    Default multi pass welds

    i've been welding for just over 4 years and i'm a third year fresh outta school. if you plan on welding a 1/2 inch gusset to 3/16 tubing there isn't any need for multi pass welds. you're fillet weld only has to be as big as your thinnest metal (3/16). if you were to multi pass and make a 3 pass 3/8 fillet you'd actually weaken the gusset. this would be because of the heat stress put into the thin material. so all said and done a 3/16 fillet is all you need, just make sure to wrap the corners on your gusset. instad of stopping when you get to the corner of the gusset continue your bead around onto the other side.

    well i hope this helps, good luck.
    Dan.

  3. #3
    Join Date
    Sep 2005
    Posts
    843

    Default

    Danno is right on the money as far as I am concerned, well said.

  4. #4
    Join Date
    Nov 2006
    Posts
    7

    Default

    Thx danno/dan...I appreciate the input. Another question if you plz...

    Below is a pic of the rotator section. How would you tackle the weld between the 2.5OD 1/4wall pin and 2.5 x 2.5 x 3/16 vertical sleeve?

  5. #5
    Join Date
    Sep 2005
    Posts
    843

    Default

    I am not sure which area exactly you are talking about. It would be helpful to know what type of process you are planning on using (mig-tig-stick?). Does this assembly have to be togeather to weld it or can sections be welded then assembled ? If you can weld the rotating piece seperate from the frame it would make it easier to get at some of the areas,allowing you to do most of the welds in a flat position on a welding table. Ya always lay better beads if you are comfortable, at least I do.

  6. #6
    Join Date
    Nov 2006
    Posts
    7

    Default

    Sorry for confusion. I've circled the 2 critical areas. Area on right is the one I addressed above, that is, intersection of inner rotator tube with vertical sleeve. You can also see a couple small adjacent gussets. The area on left is the outer rotator tube intersection with (and mounted to) the vertical post. These are both critical stress areas.

    The inner pin and attached assembly can be separated from the outer tube assembly.

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