无背衬的单面焊缝可评定有背衬的双面焊缝；
Welds made from one side without backing qualify welds made from both sides and welds with backing;
海洋平台构件中的导管、撑管，因管径小，其环焊缝只能采用单面焊双面成型焊接工艺。
Owing to the small diameters of conduit pipes and bracing tubes, the girth welding has to be done with one side welding both sides formation technology.
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.
在工艺研究中，重点应放在焊缝成型、焊缝力学性能及单面焊双面成形根焊三个方面。
In technology research focal point should put in weld become type, weld mechanics performance and single surface weld two-sided shape root weld 3 aspects.
在工艺研究中，重点应放在焊缝成型、焊缝力学性能及单面焊双面成形根焊三个方面。
In technology research focal point should put in weld become type, weld mechanics performance and single surface weld two-sided shape root weld 3 aspects.
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