Need info / advice. I am a PM for an insulation company. For years, we have used cup head pins installed with AGM capacitor discharge guns to hold insulation on bottom of ducts. The pins are 12 / 14 gage galvanized with sharp points, welded to 16 to 24 gage galvainzed ducts. These pins produce a small spot weld that holds great with a static load perpendicular to the duct surface. Now the inspector wants to "test" each pin, but these welds are small and break easily when bent.
The problem is, on this project, the specs are silent on the subject. There is no language at all in the specifications on pin pull tests, or welding requirements for this type of pin. Our insulation industry has used these pins for years because they hold as they are designed to, and do not result in blow holes in the thin galvanized ductwork.
I find tons of information on welded pins and studs, ASTM standards, etc., but I have found nothing on this type of small-weld, capacitor discharge pins. I have contacted a few of the manufacturers of these capacitor discharge welders, but no one has any information on testing / specifications for these pins. Anyone out there have any information / suggestions?
This inspector is ADAMANT in wanting to "wiggle" these pins back and forth, and we are at a stalemate. I have written an RFI to address the situation, but need some hard evidence to back up my position.