Trunk pan replacement

With that said, both adhesive bonding and welding have pros and cons. Unless you weld the replacement panel in exactly as the original factory design you would be changing the collision impact design of the car. Sooooo, which is better, is still a debate, unless specifically stated from the vehicle manufacturer.  

In the case of restoring an old car, the adhesive bonding has the pros of less welds, no heat, no burnt surfaces to cause corrosion and a quick install. Welding has the pros of economical, the tried and trusted procedure and common method of repair. I have used both and feel that one way or another may not really benefit more than the other. If you have welding skills and understand the need to replicate spot weld replacement locations and understanding plug weld tensile strength vs. factory spot weld tensile strength than you can replicate the factory panel installment. Adhesive bonding can eliminate welding and significantly reduce potential future corrosion issues. 

Both have cons and should be considered. Adhesive can make the car too strong in a collision (We try not to consider this in a restored car since we don't plan on an accident) and welding can cause serious corrosion issues if the proper steps are not taken before, during and after the welding.

I would research this and talk to professionals and make your final decision after the research on adhesive bonding vs. welding