Surface NDT hanyoyin madaidaiciyar kabu karfe zaɓi ka'idojin: Magnetic baƙin ƙarfe bututu ya kamata a yi amfani da Magnetic barbashi gwajin;Ya kamata a yi amfani da ƙarfe maras ferromagnetic a gwajin shigar ciki.Jinkirin fatattaka halayen haɗin gwiwar welded, farfajiyar yakamata ta zama gwaji mara lalacewa bayan walda sanyaya wani lokaci;reheat fatattaka hali na welded gidajen abinci, da surface ya kamata a cikin marasa lalacewa gwaji da post-weld zafi magani sau daya kowane.

Surface aikace-aikacen gwaji marasa lalacewa daidai da daidaitattun buƙatun da ke gano abubuwa da aikace-aikace gabaɗaya kamar haka:
(1) An m surface na tube abu ingancin dubawa.
(2) Muhimmiyar gano lahani na butt weld.
(3) Gano lahani mai mahimmanci na fillet.
(4) Muhimmiyar weld na soket da jumper Tee reshen bututu gano lahani.
(5) Gane lahani na bututu mai lankwasa.
(6) The abu oyan kashe gano mafi girma tsagi welded gidajen abinci.
(7) The zane zafin jiki ne kasa sifili ko mara-austenitic bakin karfe bututu beveling gano 29 digiri Celsius.
(8) Abubuwan da aka tanada na walƙiya mai gefe biyu bayan gano gouging gouging waldi
(9) Lokacin amfani da oxyacetylene harshen wuta yankan jig welded bututu gami hardening hali a kan lokacin nika sassa gano lahani.