https://joy.videvo.net/videvo_files/video/free/2014-12/large_watermarked/Man_Welding_on_Roof_1_preview.mp4 Construction Working Welding on Roof A shot of a construction working doing some welding on a steel structure. 1080pbuildingcityconstructionindustrialindustrymaskpeoplesciencesparkssteeltechnologyweldingworkworker