Abstract: Introduces working principle, process flow and equipment arrangement of pipeline automatic welding and application condition of it internationally. It points out that traditional manual welding is incompatible with the requirements of high speed and quality in the construction of long distance, large diameter and heavy wall pipeline. Advanced construction process and equipment must be provided and traditional welding process shall be renewed for pipeline construction companies if they want to go aboard to seek for cooperation, open up international market and take part in international pipeline competition.