But in the backing welding, columnar grain-growth will be appeared in the direction of crystal direction, it effects the welding quality seriously.

但是单面焊打底层焊缝中出现的沿焊缝柱状晶结晶方向的柱状气孔，严重地影响着船舶焊接质量。

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But in the backing welding, columnar grain-growth will be appeared in the direction of crystal direction, it effects the welding quality seriously.

但是单面焊打底层焊缝中出现的沿焊缝柱状晶结晶方向的柱状气孔，严重地影响着船舶焊接质量。

youdao