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backing weld
archit. 背焊
chem. 打底焊
construct. 封底焊; 底焊焊缝
met. 底层焊接
oil 打底焊道
tech. 底焊 (缝); 封底焊 (缝); 用垫环焊接; 底焊焊缝; 背衬焊; 垫板焊
wind. 底焊; 封底焊
backing weld: 5 phrases in 3 subjects
Metallurgy1
Plastics1
Technology3