Gabaɗaya ana amfani da injin preheating na induction kafin taurare ko yanayin walda. Don tsarin dumama dumama, ɓangaren da ke aiwatar da aikin kashewa bayan jiyya na preheat, zai iya magance matsalar nakasar sassa masu zafi yayin aikin sabis.

  Haka kuma, zai iya rage workpiece murdiya a lokacin hardening tsari, inganta hardening Layer rarraba, ƙara hardening Layer kauri, samun workpiece ta manufa metallographic tsarin da saura compressive danniya, da kuma kawar da quenching fasa. Preheating don tsarin walda zai iya rage yawan sanyaya adadin kewayon zafin walƙiya mai sanyaya maɓalli, hana taurin kai, da rage ductility na weld da yankin da zafi ya shafa. Yana iya rage raguwar damuwa na walda da ƙarfen tushe na kusa, musamman ga haɗin gwiwar walda mai tsananin damuwa.