If it is about stock removal and shaping for painting then the finish achieved by the unitised discs means that all you will need to worry about is control and shaping.
The Cibo SA10 unitised discs will do the job well. If it is a wider weld. Use a 6mm wide disc. If the weld build looks more like a tig weld then we recommend using a 3mm wide disc to create a tighter radius in the corner.