Back Step Welding

Lets have one together

 

thanks Rusty, you can post some good feed, make up for all those neg ones I get for slamming Bush) you have a steel boat right?
Windvang here is designing me a good easy build for my lazy days!! he is fast, and very good with CAD, and he wears clogs and has tulips for brekky

 

Dont forget to feather your start-stops. No one mentioned cold lap here. You gotta burn em in or your boat will sink...

 

So 12' seam down the center of my hull, do I tack weld and jump around or start at one end and continue to the other? If I move around, what kind of distance between sections? Thanks!

 

centreline,? you mean oh centreline bar or on a plate seam? just follow my drawing, tack along first and chip back your stops
maybe make a sketch post it on here, one of the other guys will pick it up, bedtime here

 

This is just a little boat, not a ship like most of you guys build! 12 gauge steel or 2.7 mm Airboat. Flat bottom, 88" wide bottom, 96" topsides. 5'X12' sheets with a 105 degree break at 44" (hard chine) to form the back portion and front portion curving to 5' bow, Decked over. I figured I would pretty much tack it together like a stich and glue boat, add my stringers after however was considering using some 1" .065" square tube for 2 or 3 stringers so center one could be backing the two sheets. Sound feasable? I wanted to build a truss for two of them to the height of the deck to have a strong structure to mount the engine stand but I could put one down the center as well? I don't need to as I will certainly have other areas that won't have backing and myself and machine are certainly capable of the welding task, but just trying to get as much input before I strike an arc. Thanks! Bill

 

I am very late to this thread, but it has been very helpful. I do however have more follow up questions.

1) How long would each of these sections be? Say weld 6" skip 6" weld 6"...."
2) Would you then need to back chip each one of the ends prior to welding the "skipped 6""?
3) On the reverse side of the plate, you then grind in the weld would one want to then overlap the welds as in the end of a section on one side is the middle of one on the other side of the plate?
4) When grinding the backside of a plate do you grind the weld down smooth or just enough to remove any slag?
5) At what point does one put end tabs on?

I am very interested in learning more as it appears a successful build lies in the details.

-Thanks for your expertise