Yes, if you know a good local welder you ok, The important word is GOOD!
Otherwise if the repair can be hidden I would look at some of the modern glues on the market. Be interesting to know how it broke.
That's providing the grill is made of stainless steel, if it's made of brass it's a different game. in that case I think I would the drill the very end of the bar where it sits under the cowl and rivet it. Otherwise it could get very expensive in re-soldering the grill bar and having to re-plate the whole grill
