spot welding on joints on metal roof trusses.

6500°f arc architecture background base beam blue building bumper business ceiling city column construction creates design dome electric floor flooring frame fusion galvanized handrail heat industry intense iron isolated join joint joints line mast melts metal metals office pattern perform pieces plate pole post power process rafter roof sky splice spot stairs steel structure structures supply temporary top tower triangle trusses two urban used valley vehicle wall weld welding wheel white window wing wood work