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More donuts

After the earlier post about the do-nuts I received a few questions about them, so I’ve taken a few more pictures to illustrate the procedure for welding them up.

These do-nuts can give you nice, tight radius bends that you can’t achieve with mandrel bent tubes.

oh, and yeas yes, my TIG welding isn’t the tidiest, I know, I’m a learner!

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Aluminium do-nuts come in 2 halves
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Edges to be welded are wire brushed with a brush with stainless bristles to assist in removal of the oxide layer prior to welding.
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Halves brought together.
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Halves tied together with tie-ing wire so they can be spot welded.
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The halves are then spot wleded to hold them together while seam welding is carried out.
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Halves are then seam welded together on the outer edge. The inner edge can only be welded once the do-nut has been chopped up.