Bracing shock towers?

I have a question for you all. I keep hering about factory spot welds and how week every one seams to think thay are. But I was thinking to make things stronger. Couldent you just brake out the welder and burn it better. I was just thinking this when I was looking at my factory toruqre box's on my car with a few tacks. I said "I am going to brake out the welder and burn them better". Would doing things like that help strangthine things up at all?

the factories used spot weld for the inner fenders because the inner fenders are unnessecary. When Chrysler was building these cars they took everything into consideration, aggressive driving, hard cornering, accidents, bumps on the road, etc.. & they still just spot welded them in place because inner fenders truly do nothing for your car except "help" keep road grime and water off your engine when driving in harsh weather conditions.