本衬垫可用于各种单面焊接工艺的位置，特别适用于不一定要求封底焊道的场合。

This welding backing is used with all one-side processes. Especially for those which do not demand back bead cleaning.

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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。

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

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本衬垫供单面自动焊接用F/G层的加强，也易用于弯曲部分。

This backing is used for one-side automatic welding to reinforce F/G layer. It is also easily used at bending parts.

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