[john walker's workshop]

the best tool for dressing down the weld bead is a makita hard disc grinder. thick 4" discs. they just hit the weld and not the sheetmetal around it, at least until the weld is flush. then i finish it with an air angle grinder using 2" twist-lock 80 grit and finer flex discs. be careful with heat, just like welding, as you can warp just fine with a grinder.