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John&Luke wrote:This will stiffen up the original panel and provide an overlap surface to weld. I joggle the original panel so the open edge of the joint is facing down presenting less chance of water or crud sitting in there. .
JL, i read somewhere that joggling and overlapping the panels leaves a crevice on the inside for moisture to sit, is this right or a load of rubbish? i'm about to pull the trigger on an air Joggler, it looks a far better and easier way to get backing for a good weld and like you said strengths the area for welding so less distortion
Actually just read that again! do'h you face your internal flange down to prevent moisture sitting![/quote]
Repairing any panel will always be a compromise. There will be arguments for different approaches. In my experience, distortion is the biggest challenge. If you end up with a distorted panel that will mean tonnes of filler and the lines of the rear panel will lose there crispness.
Trying to butt weld the new and old together would present massive challenges in scribing and cutting the two panels to exactly match. Any gap would need to be filled with weld and the real possibility of melting more metal away.
Joggling gets around both these problems in that you have a margin of error due to the overlap and secondly, you are are not trying to butt weld thin sheet.
In addition, joggling the original panel this will also stiffen this panel. This creates soMe resistance to any pressure that you need to apply to the new panel when welding the two together.
It just so happens that if you joggle the original panel the face will be facing downwards.
Once painted a liberal dose of waxoil etc should help prevent rust. That’s my theory, but as I started by saying, it will always be a compromise.
Hope this helps and happy to be told a different way of doing this job.
