External pipe line-up clamp and line-up welding method thereof

The invention discloses an external pipe line-up clamp which comprises a main body, misalignment control devices, gap control devices and fastening devices, wherein the misalignment control devices, the gap control devices and the fastening devices are mounted on the main body. The invention also discloses a line-up welding method of the external pipe line-up clamp. The misalignment and the gap can be effectively controlled when pipe line-up welding is performed by virtue of the external pipe line-up clamp. The external pipe line-up clamp is especially suitable for alignment installation of pipes which are not less than 200 mm in diameter. 本发明公开了一种管道外对口器，包括：主体、错边量控制装置、间隙控制装置、卡扣装置，错边量控制装置、间隙控制装置、卡扣装置安装在主体上。本发明还公开了一种管道外对口器的对口焊接方法。使用本发明进行管道对口焊接时，能够有效控制错边量和间隙，特别适用于直径200mm及以上管道组对安装。