Ya kamata a yi amfani da farantin karfe mai kauri 1.2-1.5mm don firam ɗin ƙofar wuta na ƙarfe, 0.8-1.2mm lokacin farin ciki ya kamata a yi amfani da farantin ƙarfe na bakin kofa, kuma ya kamata a yi amfani da farantin karfe mai kauri 1.2-1.5mm don ƙarfafawa. Ƙofar ƙarfe mai hana wuta da firam ɗin kofa za a cika su da kayan da ba za a iya konewa ba, kuma zafin narkewar makullin kofa, hinge, ƙulli da sauran kayan haɗin gwiwar kayan aikin kada su kasance ƙasa da 950 ℃.

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