HVAC, Sheetmetal, Sheet Metal, Sheet metal Mechanic, Commercial HVAC Sheetmetal, HVAC, Sheetmetal, Sheet Metal, Sheet metal Mechanic, Commercial HVAC Sheetmetal Fastens seems or joints together with welds, bolts, cement, rivets, solder, caulks, metal drive clips, or bonds to assemble components to products or to repair sheet metal items.