The pipe gang and welding crew are responsible for welding the various sections of pipe together into one continuous length. Using Cat® Pipelayers, the pipe gang picks up each joint of pipe, carefully aligns it with the previous joint and makes the first weld. Cat pipelayers or track-type tractors carry welding and support equipment along the right-of-way.
In recent years, contractors have used semi-automatic welding units to move down a pipeline and complete the welding process. Caterpillar has been with them along the way carrying the complex automatic welding units, computers, and the shacks that contain them using pipelayers with jib attachments.