焊一条焊缝，第一层（道）就是打底啊（通常用稍细的焊条，或用氩弧焊），焊最后一层盖面之前都算填充，很形象的，直接顾名思义就没错的。
... covering;surface layer 面层 covering the surface to weld 盖面焊 universal covering surface 万有覆盖面 ; 泛覆盖面 ; 万有覆盖曲面 ; 通用覆盖面 ...
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整个焊接接头要通过根焊、填充焊和盖面焊来完成，通过试验分析得到各焊道所对应的焊接工艺参数。
The welded joint was completed by root welding, filling welding and cover welding, their welding parameters were obtained from the experimental analysis.
采用药芯焊丝对奥氏体不锈钢管道进行打底焊接，MAG焊填充及盖面焊，立向上的水平固定全位置焊接。
Flux-cored wire is applied to the austenitic stainless steel pipe by back weld, MAG for the filling and cosmetic weld, at horizontal fixed round welding vertically up.
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