As far as I know, the pipeline welding process is as follows: firstly, according to the pipeline material, wall thickness, pressure grade and design requirements, choose the welding method, joint type, groove form, welding position, covered electrode (brand and model) and welding environment. That is, to formulate welding procedure qualification and welding procedure instruction. Among them, the groove form will have parameters such as blunt edge, weld gap and groove angle. Generally, the blunt edge of butt weld of pipeline is 1mm, the joint gap is 1.8mm-2.4mm, and the V-groove has an angle of 70 5.