... resistance butt welding对于接接触焊 inconel weld单面焊缝 pulsed metal argon-arc-welding熔化极电子脉冲氩弧焊 ...
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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.
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