Bayan bututun ƙarfe mara nauyi mai zafi, gyaran ƙwal ɗin ƙarfe, ingot ɗin yana lalata tsarin simintin, kawar da lahani da ƙananan ƙarancin bututun ƙarfe da ya haifar, ingantattun kayan inji. Kumfa na iska da ke gaban bututun ƙarfe, fasa da sako-sako, bayan zafi mai zafi a babban zafin jiki da matsa lamba za a haɗa su tare.

Ko da yake akwai da yawa abũbuwan amfãni daga zafi-birgima sumul karfe bututu, amma ta shortcomings dole ne bayyananne, bayan zafi-birgima karfe, wadanda ba karfe inclusions a cikin karfe ciki ne guga man a cikin bakin ciki yanka, stratification. Leda a cikin kauri shugabanci na karfe a tashin hankali yi aiki tabarbare sosai, akwai interlayer hawaye weld shrinkage.

Kasancewa zuwa karfe mai zafi, dole ne ya sami fasaha ta ci gaba, idan fasaha ba ta wuce ba, ƙarancin ƙarfin ƙarfe mara daidaituwa wanda ya haifar da sanyaya yayin juyawa mai zafi. Damuwa na saura a cikin rashin karfin waje yana daidaitawa a ciki, amma a cikin yanayin ƙarfin ƙarfe na waje da ke ƙarƙashin rinjayar wani mataki, alal misali, zai yi tasiri a cikin nakasawa, kwanciyar hankali, anti-gajiya.

Lokacin da karfe bayan zafi mirgina, gefen nisa da kauri iko ba shi da kyau a wannan batun saboda thermal fadadawa da ƙanƙance ka'ida, farkon zafi birgima karfe, tsawon, kauri ne misali, amma a karshen za a yi wasu kurakurai a lokacin da sanyaya, don gefen faɗin kauri mai faɗin ƙarfe mai kauri sannan kuma mummunan bambanci zai zama bayyane.