root opening

风暴 - 歪酷博客 Ycool Blog ... root of penetration 焊缝根部 root opening 根部间隙 root pass 根部焊道 ...

美英加陆军规格_馆档网 ... "1.螺纹谷线 2.齿底线"," root line" "根间隙(熔接)"," root opening" "熔透量"," root penetration" ...

...pth)、“熔深”(Penetration) 和“钝边间隙”(Root Opening) 指定相应的焊缝尺寸。