I just started my restoration on my 1982 F100. When I weld in the new panels, like bottom door skin and cab corners should I butt weld them in or use a lap joint? Check out my truck and you'll see all the rust that Im having to replace with new panels. Thanks Fred

 

I would rather have a butt welded but it can be a little more difficult sometimes. Nothing wrong with a lap weld if you use weld through primer and seam seal the back lip.

 

Thanks for the information. I've used butt welds so far when I replace the floor pan/ outer rocker panel. Fred

 

Not being the best welder, I used a lap joint. But before tacking the patches, I trimmed the recessed sections down to where there was less than 1/8" of surface for the patch to rest on. I also used weld thru primer and two types of sealer on the inside. FYI, I bought a $20 panel flanger from Harbor Freight (Central Pneumatic) and it worked great.

 

I also have the harbor freight flanging tool, didn't expect much when I ordered it but have been surprised as it has done a very good job where used. It also will punch holes for spot welding.

 

in my oppionion the butt weld is the best , the flange is ok IF you use weld thru primer and seal all the areas that can wick moisture . I have seen panels that have been replaced using a flange (sp late and tired) and rust was a problem between the two . so if there butt welded that cant happen.
just my .02