Wagner Welding Supply Company Share: Welding/Welding Gas & Supply Wagner Welding Supply Company Request Info 10 Gay Street PO Box 161 Longmont, CO 80502 303-776-1491 303-774-1422 (fax) About Map About Whether you need medical gas, welding gas and industrial gas, or cylinder rentals and refills, you can rely on Wagner Welding Supply and Metro Medical Oxygen in Longmont to provide What's Nearby? Distance: 5 10 15 20 25 50 mi.