A cikin tsarin samar da walda na karfe, za a sami rashin lahani na karfe idan hanyar walda ba ta dace ba.Mafi yawan lahani shine fashewar zafi, fashewar sanyi, tsagewar gurguzu, rashin haɗuwa da shigar da bai cika ba, stomata da slag.

Zafafan fata.

Ana samar da shi a lokacin sanyaya na walda.Babban dalilin shine sulfur da phosphorus a cikin karfe da waldawa suna samar da wasu gaurayawan eutectic, gaurayawan suna da rauni sosai kuma suna da ƙarfi.A lokacin sanyaya na walda, eutectic gaurayawan za su kasance a cikin tashin hankali yanayi sabõda haka, da sauƙi fashe.

Ciwon sanyi.

Har ila yau, an san shi da jinkirta fashewa, ana samar da shi daga 200℃zuwa zafin jiki.Za a fashe bayan ƴan mintuna ko da ƴan kwanaki.Dalilin yana da alaƙa da alaƙa da ƙirar tsarin, kayan walda, ajiya, aikace-aikace da hanyoyin walda.

Lamellar Tearing.

Lokacin da aka sanyaya zafin walda don rage digiri 400, wasu kauri daga cikin farantin yana da girma da ƙarancin ƙazanta, musamman abun ciki na sulfur, kuma yana da ƙarfi daidai da jagorar mirgina tare da takardar babban ƙarfin ƙarancin gami da rarrabuwa lokacin da yake. hõre wani karfi perpendicular zuwa kauri shugabanci a cikin walda tsari, shi zai samar da mirgina shugabanci tako fasa.

Rashin Fusion da Rashin Cikakkun Shiga.

Dukansu dalilin shi ne m guda, da bai dace da fasaha siga, matakan da tsagi girma, da tsabta bai isa ba na tsagi da weld surface ko matalauta walda fasaha.

Stomata

Babban dalilin samar da porosity a cikin weld yana da alaƙa da zaɓaɓɓen, adanawa da amfani da kayan walda, zaɓin sigogin tsarin walda, tsabtace tsagi da matakin kariya na tafkin walda.

Slag.

Nau'i, siffa da rarraba abubuwan da ba na ƙarfe ba suna da alaƙa da hanyoyin waldawa da sinadarai na walda, Flux da ƙarfe weld.