The invention discloses a network-based pipeline all-position 
welding control system, comprising a master 
control unit (4), wherein the master 
control unit (4) is used for outputting 
welding parameters of each spatial feature points by a 
control network, transmitting data, such as positions, speed, torque and the like by the 
control network and a 
welding tractor system, and simultaneously transmitting aperiodic data, such as, configuring parameters, state information and the like between the 
control network and the welding 
tractor system; all procedure parameters of a 
motion control system are transmitted to the master 
control unit (4) through the control network; a welding 
tractor traveling control unit (11) is used for performing interpolation calculation to obtain a welding parameter of a current spatial position; and a 
welding power supply (3) is used for calculating matched wire feeding speed and performing 
arc welding by using the welding parameter of the position so as to realize the continuous variation of the 
welding process parameters. The network-based pipeline all-position welding 
control system disclosed by the invention is simple in structure and reliable in operation, and can be used for realizing the computer-based integrated control over a pipeline 
welding process and realizing the cooperative control over all subsystems through the control network, and thus, the welding quality and the welding speed are increased.