Pipe welding involves joining pipes together without fittings through various welding positions and techniques. It is more complicated than structural welding due to the cylindrical shape of pipes. There are four principal pipe welding positions defined by the orientation of the pipe: horizontal rolled (1G), vertical (2G), horizontal fixed (5G), and 45-degree inclined (6G). Additionally, there are restricted positions (R), fillet welds (F), and groove welds (G) used in pipe welding. Improperly executed pipe welds can lead to ultimate failure of the pipe at the welding point.