I've got this piece of angle I picked up from the dump shop specifically for making a mandrel bracket to make a couple of gears.
It's 13mm thick and about 90mm wide. For further size judgement the holes are around 50mmm.
I need a 'C' shaped bracket so I intend to cut it so I end up with two angles 60mm x 40mm and 45mm wide, then butt weld the two 40mm sides, so I'm left with a 'C' 80mm long.

Since welding is not my strongest point, I thought I should get some advice here.

I need to mount the 'C' to my vertical slide on the lathe so it will need machining flat after it's welded. I'll figure out how I'm going to "chuck" it for machining later.
For welding it, I figured I'd grind a V on both sides of the butt joint and do several runs both sides. Is that the best way to do it ?
I'm also concerned about weld shrinkage and bending at the joint cos I need to minimize machining and need the ends as close as I can get to 90deg .

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