Hakanan bututun da aka yi masa walda mai ƙananan diamita ana kiransa bututun ƙarfe mai ƙaramin diamita, wanda shine bututun ƙarfe da aka yi ta hanyar walda farantin ƙarfe ko kuma ƙwan ƙarfe bayan an datse shi. Tsarin samar da ƙananan diamita na welded bututu yana da sauƙi, ingantaccen samarwa yana da girma, akwai nau'o'in iri da ƙayyadaddun bayanai, kuma farashin kayan aiki kaɗan ne, amma ƙarfin gabaɗaya ya fi na bututun ƙarfe mara nauyi. Tun daga 1930s, tare da saurin ci gaba na ci gaba da samar da ingancin tsiri mai inganci da haɓaka fasahar waldi da dubawa, an ci gaba da haɓaka ingancin walda, kuma iri-iri da ƙayyadaddun bututun welded na ƙananan diamita suna ƙaruwa kuma maye gurbinsu a cikin ƙarin filayen bututu maras nauyi. Welded karfe bututu ne zuwa kashi madaidaiciya kabu welded bututu da karkace welded bututu bisa ga nau'i na weld.

Wuraren da aka yi amfani da su don ƙananan bututun walda, faranti ne ko ɗigon ƙarfe, waɗanda aka raba su zuwa bututu masu walƙiya ta wuta, bututu masu walda da lantarki (juriya mai walƙiya), da bututun walda ta atomatik saboda tsarin waldansu daban-daban. Akwai nau'i biyu na bututun welded: madaidaiciyar bututu mai walƙiya da kuma bututu mai walƙiya. Saboda kamanninsa na ƙarshe, an raba shi zuwa bututu masu walƙiya zagaye da bututu masu siffa ta musamman (square, lebur, da sauransu).

Tsarin samar da ƙananan diamita welded bututu yana da sauƙi, ingantaccen samar da inganci, ƙananan farashi da haɓaka mai sauri. Ƙarfin bututun welded gabaɗaya ya fi na madaidaicin bututun welded. Ana iya samar da bututu masu walda tare da diamita mafi girma daga kunkuntar billets. Hakanan za'a iya samar da bututu masu welded tare da diamita daban-daban tare da billet ɗin faɗin iri ɗaya. Duk da haka, idan aka kwatanta da madaidaiciyar bututu mai tsayi iri ɗaya, tsayin weld ɗin yana ƙaruwa da 30 zuwa 100%, kuma saurin samarwa ya ragu. Don haka, ƙananan bututun welded ɗin bututu mafi yawa madaidaiciya madaidaiciya, kuma manyan bututun welded ɗin manyan diamita galibi suna waldawa ne.