The KCM005 two-way autogenous welding machine with K 922-1 head is designed for welding of rails in the track. The head, together with the unit and auxiliaries, is mounted on a truck with a chassis enabling driving on the road and on the railway track. The head allows autogenous welding of rails with basic profiles. The autogenous welding process is controlled by a computer system, ensuring repeatability of the process and appropriate quality of joints. The control system monitors and records welding parameters such as autogenous welding current (I), transformer voltage (U), travel distance (S), pressure (P) as a function of time. The autogenous welding program allows for presparking, sparking with increasing speed, swelling, cutting off the bead of molten material and, if necessary, heat treatment.