R45 is a copper coated gas welding rod that is used for welding ordinary low carbon steel up to 1/4” thick. It is recommended where ductility and machinability are most important. R45 produces high quality welds which are ductile and free of porosity. This rod is excellent for steel sheets, plates, pipes, castings and structural shapes. No flux required. Clean joint and bevel heavy sections keeping torch tip at low angle to base metal. Pre-heat normally not necessary as your torch will preheat during your process. Use a neutral flame or a very slight excess of acetylene (reducing flame). AWS changed this class from “RG” to “R” in 1969.