The invention provides a pipeline
welding method. The pipeline
welding method comprises the steps that the
welding ends of two welding pipes are pretreated; the welding ends of the two welding pipes are oppositely arranged, and an assembling gap is formed between the two welding ends; a plugging tool is provided, the plugging tool comprises two plugging sponges, an
exhaust pipe and an
exhaust valve, the two plugging sponges are installed in the two welding pipes correspondingly and are arranged close to the welding ends, so that an inflation area is formed on the
peripheral side of the assembling gap, one end of the
exhaust pipe is connected with one of the plugging sponges, and the other end of the
exhaust pipe is connected with the other plugging
sponge; the other end of the exhaust
pipe is arranged outside the inflation area and is connected with the
exhaust valve; and an inflation tool is provided, the inflation tool penetrates through the other blocking
sponge to stretch into the inflation area, the inflation area is filled with
nitrogen, the welding ends of the two welding pipes are welded when air in the inflation area is exhausted, and when the two welding ends are to be folded, the
exhaust valve is opened. According to the method, the
gas consumption is reduced, and the production efficiency and the welding quality are improved.