With Aluminium repairs you would are looking at AC TIG welding rather than the more common DC TIG Welding. The AC TIG equipment is 5x more expensive and really doesn't agree with electrical equipment, hence Roger's comments.This copied from BBC news, not a case of pointing a TIG welder at it then !!
Given the depth of the cracks welding could just be described as the equivalent of not much more than papering over the cracks and would be a temporary fix.