The down welding process is applied extensively in long petroleum pipeline construction.

下向焊工艺已经广泛用于长输管道建设工程中。

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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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A new welding technique on down-welding has been widely used in welding of long distance pipeline.

下向焊这种焊接新工艺在国内已广泛用于长输管道的焊接。

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U.S. and Iraqi officials agree that smuggling of crude oil seems to be less than was previously thought, and some of the pipeline failures that were routinely put down to acts of sabotage may have been due to corrosion or faulty welding.

NPR: Iraq Oil Minister Vows to Fight Corruption, Smuggling