For vertical upward pipe, usually need to bend down;

②如有垂直向上的管道，通常必须拆弯管；

youdao

The project position of welder qualification test for long transporting pipe depends on vertical down welding basically, which is namely fixed pipe with axis horizontal welding (5gx).

长输管道的焊工考试项目位置基本以向下焊为主，即水平固定全位置焊(5gx)。

youdao