PROTECTING GALVANIZED SHEET METAL
PROTECTING GALVANIZED SHEET METAL
(OP)
We build sound attenuation systems and structures for power generation projects. Currently, we are looking into insulated panels made from 16 gauge, G90 galvanized, commercial quality sheet steel in 60 inch wide strips.
Here is our problem. The panels are too wide to be unsupported. We could really use a cold formed center stiffener. For best structural performance, we would want to stitch weld this stiffener to the inside of the panel. The problem is that the heat from welding could degrade the galvanizing. If that happens, we have just another patched, zinc primed panel and no longer tha advantage of mill-galvanized material.
Does anyone know of a way to weld the stiffener on the inside face of 16 gauge sheet without damaging the galvanizing on the outside face. We are already thinking about thin wire, pulse arc MIG, but even that may still be too hot used just by itself. Have you other suggestions?
Here is our problem. The panels are too wide to be unsupported. We could really use a cold formed center stiffener. For best structural performance, we would want to stitch weld this stiffener to the inside of the panel. The problem is that the heat from welding could degrade the galvanizing. If that happens, we have just another patched, zinc primed panel and no longer tha advantage of mill-galvanized material.
Does anyone know of a way to weld the stiffener on the inside face of 16 gauge sheet without damaging the galvanizing on the outside face. We are already thinking about thin wire, pulse arc MIG, but even that may still be too hot used just by itself. Have you other suggestions?





RE: PROTECTING GALVANIZED SHEET METAL
RE: PROTECTING GALVANIZED SHEET METAL
Could you possibly use some of the newer chemical bonding techniques?
Rod
RE: PROTECTING GALVANIZED SHEET METAL
I can't think of any method that involves heat that would not damage the zinc coating...Mike
RE: PROTECTING GALVANIZED SHEET METAL
RE: PROTECTING GALVANIZED SHEET METAL
RE: PROTECTING GALVANIZED SHEET METAL
If mill galvanized sheet is the only way to go, consider bending an "L" or "U" at the midspan of two sheet and bolt them together. This will provide the stiffness you need and eliminate the welding. It is commonly done for panel assemblies in packaged equipment such as air handling units, cooling towers, fan housings, etc.