Prefabricating method for straight welding seam arc striking and extinguishing plate of structural pipe

The invention discloses a structural pipe straight weld arc striking and extinguishing plate prefabricating method which comprises the following steps that S1, a blanking plate is taken out for integrated nesting machining, and protruding straight edges are reserved at the four corner ends of the blanking plate of a preset structural pipe; s2, gas welding cutting of a semi-automatic trolley is carried out on the portion, except for the protruding straight edge, of the blanking plate; s3, the blanking plate obtained after gas welding cutting is completed is rolled into a structural pipe; and S4, the reserved protruding straight edge serves as a run-on and run-off plate to be directly used for welding. According to the invention, through integrated trepanning processing of the blanking plate, the convex straight edges are reserved at the four corner ends of the blanking plate of the preset structural pipe to be used as arc striking and extinguishing plates, so that the construction process is optimized, and the