Pipeline welding process

The invention provides a pipeline welding process. The pipeline welding process comprises the steps of welding a root layer through manual welding and welding a filling layer and/or a cover surface layer through an automatic welding machine. The welding process provided by the invention has the advantages that under the circumstance of not increasing welders on a large area, the construction progress is promoted and the labor cost is greatly reduced; the welding construction of large-diameter thick-walled pipelines can be carried out on a large area and the production efficiency is high; moreover, the first pass yield of welding lines is high by adopting the welding process provided by the invention, unnecessary reworking is avoided, the construction quality is high and the quality cost isreduced; and the operability of the construction process is high, the operation is easy, the quality accident rate and the safety accident rate in the practical application are both zero and the process is safe and reliable.