Auto body repair & detailing: Welding to remove damaged panels, acetylene torch, acetylene welding


Question
I have a 1989 Honda Accord which was involved in a rear ender backing up accident in a parking lot about 3 months ago. The Hood was damaged as well as the right portion of the Radiator Support that lies behind the recessed motorized headlight. Eventhough the car is in remarkable mechanical condition ie no oil leaks, manual tranny is smooth and engine seems fine, it doesn't look real great as far as the damage is concerned. Due to the age and high mileage on the vehicle and the low bluebook value, going to an autobody shop seemed outta the question. So I've decided to repair it myself
The question i need to ask is how do I go about dewelding the tack welds to replace the portion of the radiator support that is damaged? I have done oxy acetylene welding in the past and have access to it. Can this be used to remove the damaged portion and to weld in a new piece? Oh and my shoplight was on till past 1am tonight :)

Answer
I do auto body (i.e., maybe an all around weld to shut a hole or fill it with fiberglass, or both; bondo; shape; prime; and paint); as I don't specialize in collision work (straightening out pieces, parts, panels, and frames).  

However, when I do, on occasion, face down spot welds (such as replacing a door skin), I've just drilled out the spot welds using a 1/2" bit; or, for those tough to reach spots, I use a small pneumatic grinder; and have never even though about "de-welding" with an acetylene torch, but who knows?  

As I like to weld holes shut or fiberglass; and, if I can't, then I prefer replacing a panel rather than straightening one...as I got to hand it to those frame straightening people...that's an skill and and art all to its self.

Generally, I stay away from collision work, and focus on classics that need everything but straightened.