Da farko, duba kamannin shine mataki na farko. Ya kamata saman bututun ƙarfe mara shinge ya kasance babu kumfa, ƙaiƙayi, canza launi, tsagewa da sauran lahani. Waɗannan lahani ba wai kawai suna shafar kyawunsa ba, har ma suna iya haifar da matsaloli daban-daban yayin amfani da samfurin har ma suna haifar da haɗarin aminci. Saboda haka, ta hanyar duba kamannin, ana iya fara tantance samfuran da ba su da inganci.

Na gaba shine duba girman bututun ƙarfe mara sumul. Daidaiton girman bututun ƙarfe mara sumul yana shafar aikinsa kai tsaye. Saboda haka, dole ne a auna mahimman sigogi kamar diamita, kauri bango, da tsawon bututun ƙarfe sosai kuma a sarrafa su. Sai lokacin da waɗannan sigogin girma suka cika sharuɗɗan da aka gindaya ne za a iya tabbatar da kwanciyar hankalin bututun ƙarfe da ake amfani da shi.

Gwajin kayan aiki shi ma muhimmin abu ne. Kayan bututun ƙarfe mara shinge yawanci yana ƙunshe da nau'ikan abubuwan ƙarfe iri-iri, kamar carbon, manganese, silicon, phosphorus, da sauransu. Yawan waɗannan abubuwan yana shafar halayen injiniya da aikin sarrafa bututun ƙarfe kai tsaye. Saboda haka, dole ne kayan aikin su yi gwajin sinadarai masu tsauri don tabbatar da cewa sun cika ƙa'idodi masu dacewa.

Halayen injina da gwajin aikin sarrafawa suma suna da alaƙa mai mahimmanci. Waɗannan gwaje-gwajen galibi sun haɗa da gwajin tensile, gwajin tauri, gwajin tauri, gwajin faɗaɗawa, da sauransu. Waɗannan gwaje-gwajen na iya nuna cikakkun halayen injina da halayen sarrafa bututun ƙarfe. Ta hanyar waɗannan bayanan ganowa, masana'antun za su iya zaɓar hanyoyin samarwa masu dacewa don yanayin aikace-aikacen samfurin daban-daban don tabbatar da aikin samfur.

A ƙarshe, gwajin da ba ya lalatawa shi ma muhimmin hanya ce ta gwaji mai inganci ga bututun ƙarfe marasa shinge. Hanyoyin gwaji marasa lalatawa kamar gwajin rediyo, gwajin ultrasonic, da gwajin barbashi na maganadisu na iya gano lahani kamar fashe-fashe da abubuwan da ke ciki da kuma saman bututun ƙarfe. Waɗannan lahani suna da wahalar ganowa yayin dubawa na yau da kullun, amma suna iya yin babban tasiri ga rayuwar aikin bututun ƙarfe. Saboda haka, ta hanyar gwajin da ba ya lalatawa, ana iya ƙara tabbatar da ingancin samfuran bututun ƙarfe marasa shinge.
A takaice, domin tabbatar da ingancin kayayyakin bututun ƙarfe marasa shinge sun cika ƙa'idodi, cikakken gwaji na bayanai daban-daban hanya ce mai mahimmanci. Waɗannan ƙa'idodin gwaji ba wai kawai sun haɗa da sigogi na asali kamar bayyanar, girma, da kayan aiki ba, har ma sun shafi fannoni da yawa kamar halayen injiniya, aikin sarrafawa, da gwaji mara lalata. Ta hanyar waɗannan gwaje-gwajen gabaɗaya, ana iya kimanta ingancin samfuran bututun ƙarfe marasa shinge sosai don tabbatar da amincinsu da kwanciyar hankali yayin amfani.