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bolt holes

If you are talking about a permanent fill, I weld a piece of sheetmetal to the backside and fill the hole with bondo. If I had a torch I would fill the hole with brass. If you are talking about a temporary fill, I use plastic snap in hole plugs.
 
I fill holes using a mig welder and place a piece of copper behind the hole then weld from the front edges in until the hole is filled in. Then use a flap wheel to smooth. A little practice and you can"t tell a hole was there.
 
I am unclear, is the copper part of the repair or just there to support the weld while it is being laid down? If the latter, shouldn't the weld be able to be finished on both sides?
 
The weld will not stick to the copper. If you clamp the copper to the metal tightly, when you remove the clamp the copper will fall off and the weld on the back will be smoother than the front.
 
The copper acts as a dam for the mig wire to build up against but not stick to. The copper can be more considered a reusable tool and does not melt. They sell them at Eastwood but the best ones are made from an old piece of electrical bus. Some have a handle attached. It is just another tool in the welding box for rstoration use.Even a thin copper sheet will work.
 
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