內焊機根焊+外焊機自動焊技術。采用多焊炬內焊機進行組對和根焊，外焊機自動焊進行熱焊、填充和蓋面焊。自動焊機組整體效率較高，但由于內焊機爬坡能力以及自身可通過的曲率半徑等受限，僅適用于地形起伏普遍小于15°的平原、戈壁等主線路焊接段的連續焊接。

Internal welding machine root welding+external welding machine automatic welding technology. Using a multi torch internal welding machine for pairing and root welding, and an external welding machine for automatic welding for hot welding, filling, and cover welding. The overall efficiency of the automatic welding machine group is relatively high, but due to the limited climbing ability of the internal welding machine and the curvature radius it can pass through, it is only suitable for continuous welding of main line welding sections such as plains and Gobi with terrain undulations generally less than 15 °.

　　銅襯墊內對口器+外焊自動焊技術。采用銅襯墊技術實現根焊單面焊接雙面成形。在進行單面焊接時，在焊縫背面貼附一種陶質或者銅質襯墊，封堵焊件對接處的坡口縫隙，從而約束焊接熔池形態，形成良好的焊縫質量。

Copper lining inner aligning device+external welding automatic welding technology. Using copper liner technology to achieve root welding with single-sided welding and double-sided forming. When conducting single-sided welding, a ceramic or copper backing is attached to the back of the weld to seal the groove gap at the joint of the welded part, thereby constraining the shape of the welding pool and forming good weld quality.

　　外焊機自動根焊+單焊炬外焊機填充蓋面技術。采用外焊機根焊，單焊炬外焊機熱焊、填充和蓋面。焊接設備配置簡單靈活，便于組織施工，施工成本較低。可用于障礙物較多、不能實現大流水作業的一般地段連續施工，特殊地段預制或連續施工，以及連頭段施工。

External welding machine automatic root welding+single torch external welding machine filling cover technology. Using an external welding machine for root welding, a single torch external welding machine for hot welding, filling, and covering. The configuration of welding equipment is simple and flexible, making it easy to organize construction and reducing construction costs. It can be used for continuous construction in general areas with many obstacles that cannot achieve large-scale production, prefabrication or continuous construction in special areas, and construction in connecting sections.

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