[arcticman]

You are correct. It is not welding its brazing. Welding is a fusion process wereas brazing is an adhesion process. BIG difference and you dont want to confuse them.Back in the day we used tourch and rod. I've never had an issue with Bondo not stickig to bronze. The advantage I see with using a MIG is the control you have with heat and therefore less distortion. I also agree that a butt joint with a root gap to allow penitration to the back side is a good option but its not the only one as is the case with this hood. For this job I used a lab joint. As a matter of fact most of the brazing I've seen on vehicles is a lab joint. Some vehicle makers are recommending it be used when replacing QT. panels at the section with a butt joint.