In horizontal position welding, the gravity makes molten metal flow downward and sometimes causes weld defects such as undercut and overlap.

横向焊接时由于熔化金属重力的作用，会引起熔池金属下淌，从而产生咬边以及焊瘤等焊接缺陷。

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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)。

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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)。

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