Here is the patch panel almost completely prepared for welding. The copper backing (a flattened piece of copper pipe) was attached to the back of the piece with sheetmetal screws and pennies with holes for washers. The copper backing acts as a giant heat sink, as well as a cool way to fix any spot that blows through the metal. Picture taken on : Sun Jul 14 20:48:00 PDT 2002   (5/9)