Don bututun iskar gas mai nisa, yin amfani da babban bututun karfe shine babbar hanyar adana farashi.Ayyukan masana'antar bututun na Kanada sun tabbatar da cewa: idan aka kwatanta da X60, ɗaukar kaurin bangon bututun na X70 na iya rage 14%; Idan aka kwatanta da X70, ɗaukar kaurin bangon bututun na X80 na iya ƙara raguwa da kashi 12.5%.Welding yana daya daga cikin mahimman hanyoyin haɗin gwiwar kera bututun ƙarfe da gina bututun, saboda rashin daidaituwar yanayin yanayin walda, yankin da zafin walda ya shafa (HAZ) wani yanki ne mai rauni na bututun.Kwancen kwantar da hankali shine babban ma'auni don ƙayyade aikin ƙungiyar HAZ, yana da alaƙa da shigarwar waldawa, kauri na workpiece da yanayin radiation kewaye.Saboda haka, yin m waldi tsari, iko waldi sanyi gudun iya samun m kungiyar yi na HAZ, kauce wa HAZ fasa, don tabbatar da aminci aiki na bututu.

Tare da karuwa da yawan sanyaya, microstructure na X80 bututun karfe HAZ an ba da fifiko ga polygonal ferrite, don ba da fifiko ga B ko hatsi na lath martensite, taurin zai ƙara.Lokacin shigar da zafin walda ya yi girma sosai ko zafin zafin jiki ya yi yawa kuma saurin sanyaya ya yi ƙasa da 2℃/ s, X80 bututun karfe HAZ kungiyar da aka ba fifiko ga tare da ko B polygon ferrite hatsi, amma saboda wanzuwar pearlite da MA tsibirin kungiyar block rarraba, kai ga m crystal tasiri yi matalauta.Lokacin shigar da zafin walda ya yi ƙanƙanta ko zafin zafin zafin ya yi ƙasa da ƙasa kuma saurin sanyaya ya fi 30.℃/ s, X80 bututun karfe HAZ kungiyar da aka ba fifiko ga tare da BF ko lamellar martensite, sakamakon da rage m crystal tasiri yi.Yin tsarin walda mai ma'ana, sarrafa ƙimar sanyaya a cikin iyakar 2 ~ 30℃/ s, X80 bututun karfe HAZ kungiyar da aka ba fifiko ga B, MA tsibirin kungiyar da aka warwatse, da m hatsi yankin yana da dace taurin da kyau kwarai tasiri yi.