The key technical points in the development of dedicated software for intelligent welding include the identification and discrete method of weld trajectory and the automatic generation method of welding torch attitude.For the task of dedicated welding software that needs to independently identify the weld trajectory,plan the welding path,and generate the welding torch attitude in real time,combined with the Open CASCADE development platform,a method of welding seam trajectory discrete algorithm and automatic generation of welding torch attitude without relying on commercial CAD/CAE software was proposed.The rationality and effectiveness of the methods including the discrete weld trajectory and the generation of the welding torch posture have been verified through welding simulation experiments,MATLAB discrete accuracy analysis of weld trajectories,and robot weld trajectory walking experiments.