采用管道输送燃气是目前最有效、最直接的一种输送方法。在北京引进陕甘宁天然气管道工程施工中,为满足高压要求,确保管道运行安全,采用了氩弧焊打底的焊接新工艺。一、氩弧焊的优点氩弧焊是使用氩气作为保护气体的一种气体保护焊。它利用从焊枪喷嘴中喷出的氩气流在电弧区形成严密封闭的气层,使电极和金属熔池与空气隔绝,以防止空气的侵入。同时利用电弧产生的热量,来熔化基本金 Pipeline gas is currently the most effective and most direct method of delivery. In the introduction of the Shaanxi-Gansu-Ningxia natural gas pipeline construction in Beijing, in order to meet the high pressure requirements and ensure the safe operation of the pipeline, a new welding process using argon arc welding was adopted. First, the advantages of argon arc welding TIG welding is the use of argon gas as a protective gas welding. It utilizes a stream of argon gas emanating from the torch nozzle to form a tightly closed gas pocket in the arc zone, isolating the electrode and the metal bath from the atmosphere to prevent intrusion of air. At the same time using the heat generated by the arc, to melt the basic gold