Porosity is often found when using low-hydrogen electrodes such as E-7018, and it may be difficult to establish why this occurs.
孔隙度是经常发现在使用低氢焊条例如e - 7018，它可能会难以确定为什么发生这种情况。
This practice is much more common with low hydrogen electrodes, since the core wire melts up inside the flux coating.
这种做法较为普遍，低氢焊条，因为融化的核心线内的通量涂层。
In a separate use or for the thick-walled tube welding, heat-resistant steel should use low hydrogen electrodes.
在单独使用或用于厚壁管焊接时，应选用低氢耐热钢焊条。
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