背面焊道[缝]

back bead的用法和样例：

例句

The back purge shall be maintained for a minimum of two passes.至少对两条焊道进行惰性气体反吹。
This welding backing is used with all one-side processes.Especially for those which do not demand back bead cleaning.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。

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bumbye