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封底焊 fēngdǐ hàn
archit.	backing up
auto.	back counter revoluting; sealing weld
chem.	backing run; sealing welding
met.	back run welding; sealing run; back running
oil	back run
tech.	backing pass; backing-up; backing weld (缝); back weld (缝); back welding; root run
wind.	back sealing weld; backing weld
封底焊缝 fēngdǐ hàn
construct.	backing weld
封底背面焊缝
gen.	backrun
封底〔背面〕焊
transp.	backing pass

封底 焊: 18 phrases in 6 subjects

Chemistry	1
Electric machinery	1
Metallurgy	5
Oil / petroleum	3
Plastics	3
Technology	5