Welding will be starting soon

[Steinerj56]

As part of my restoration my welding projects will begin.

I have some small holes in the doors from the big camper mirrors that were installed. I removed them. I have been told to use a block of brass on the back side so the hot weld doesn't fall in the door and cause other issues.

Any ideas where to find a block of brass?
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[Shaun1162]

Most hardware stores shoe have some decent size brass plate that would work well.

I might also suggest brazing the holes. When I worked at a body shop, on restorations where previous owners had drilled holes in the door for mirrors, or in the back bed for whatever reason, my boss would braze up the holes. Then you could use a die grinder and grind them smooth and be pretty much done, where welding will often distore the metal because of the heat

[Steinerj56]

What do you mean by brazing?

Research online says melting a piece of metal into the hole almost like soldering. What would/should I use here?
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[BMERDOC]

Copper also works. Any non-ferrous metal. The easiest tool I've heard of is a piece of copper tubing with a portion smashed flat and bent for ease of access.

[Mike Bradbury]

Brazing is very similar to soldering but it is done with a hotter torch. Soldering is done around 600* where as brazing is done around 800*. Brazing uses a acetylene torch and possibly gets the surrounding metal hot enough to distort and give you trouble. I recommend a 110 volt MIG welder using .023 wire where you can just trigger a small amount of weld at a time.
True welding is a much hotter process but it is much more controlled in the MIG process and will leave you with much less distortion in the end.

If you are just filling some small holes then do as Doc said and get about a 1" copper tube from the hardware store and flatten it out. Getting a good tight fit is critical for this theory to work. If there is an air gap it is not going to dissipate much heat. If the hole is rusty I recommend drilling to the next size bigger hole so that you have a good clean rust free surface to weld to.

[61K10]

anywhere you won't see the the inside of the hole, i cut round or square pieces of sheet metal for the back of the hole.(might need a another hand) weld in. much easier than trying to fill a open hole. unless they are small. have used the flattened copper tube which works great for small holes. good luck----