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1 概述大管径管道全位置下向焊，是目前比较先进的管道焊接工艺，可实现良好的单面焊双面成形，焊接质量容易控制。近几年在石化行业得以推广使用，江苏油田焊培中心被国家质量技术监督局指定为培训试点单位。管道下向焊主要特点为：①焊接速度快，生产效率高。管道焊接采用专
1 Overview Large diameter pipe full down to the next welding, is currently more advanced pipe welding process, can achieve a good single-sided double-sided welding, welding quality easy to control. In recent years in the petrochemical industry to promote the use of Jiangsu Oilfield Welding Center was designated as the National Quality and Technical Supervision pilot training units. Downward pipe welding main features are: ① welding speed, high production efficiency. Piping welding exclusively