One of the backing plates on my rear drum brakes has two holes rusted in it that I would like to grind down and weld a plate over to repair it. The ideal way to do this would be to take the backing plate off, but looking at the FSM, it doesn't look too easy. My question is, would there be any issues with welding the backing plate while it is still attached to the brake assembly. I wasn't sure if there would be any problems with bearings, grease, bearing surfaces, etc getting screwed up during welding. I intend to just take the wheel and tire off to do the repair. I am new to welding so any tips would be appreciated.