Auto Painting, Automotive, Welding

Auto Restoration Welding A Hole Closed

Auto restoration welding a hole closed.

Anyone ever tell you that you can’t weld a hole closed? Well guess what, you can. With a little bit of practice, you will be able to weld a 1/16″ hole closed or a 12″ hole closed. You can do it, and I will show you how. First practice, practice, practice. You may not be able to do it on your first try, but you will do it. Take a couple of scrap pieces of sheet metal and drill some holes in them. Start with very small holes, maybe 1/8″ in diameter. Get your Mig settings right and aim your wire on the edge of the hole opening against the sheet metal. Just give short bursts of the trigger. When you see the bright orange molten bead release the trigger and let cool until the orange disappears. Then strike another bead and let cool. Continue This process until the hole is closed. This is the method to fill a hole in any piece of sheet metal. If the hole is large, you can use a copper spoon behind the hole, to assist in filling the hole. Weld will not stick to the copper and it acts as a backing plate. Once the weld cools it leaves a nice flat weld. I used this method on a 2015 Mazda 3 fender that came with accessory holes that were not used. I merely welded them closed.

New Fender Trim Holes Not Needed
New Fender Holes Are Now Welded Closed

With some practice, you will be able to do the same.

Please come back often. I will post some videos on auto restoration welding a hole closed in the future.