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Circuit drawing double side.

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Looking at the board it appears that there is only 2 sides to the board.
Checking this out with a light under the board I can only see the 2 sides Top and bottom
 
Well that's good news, at least!

I must say you're not really going about the repair in the right way. Usually you don't reverse-engineer the entire board, you troubleshoot individual sections to find where the problem lies. That, of course, comes after a thorough visual inspection of all parts.

How about starting fresh: What is the welder doing when you try to turn it on? Is it completely dead? If so, chances are it's a problem with the power supply. That's usually the best place to start.
 
If you had a Program Like "Sprint Layout 6.0", you could upload those pictures into it and Draft It to create a PCB artwork.
 
The jumper wire indicates a repair or modification. If you are wanting a standby board, consider the time it'll take to rebuild the board from scratch.
 
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