Wuraren zamewar masana'antu galibi ana yin su ne da ƙarfe ko simintin ƙarfe. A lokacin amfani na dogon lokaci, saboda nau'ikan juzu'i daban-daban a tsakanin filayen tuntuɓar biyu, za a haifar da nau'ikan karce daban-daban da damuwa a saman layin dogo, wanda zai shafi kayan aiki sosai. Gudanar da daidaito da ingancin samarwa. Hanyoyin gyare-gyare na al'ada yawanci suna amfani da hawan farantin karfe ko hanyoyin maye gurbin, amma ana buƙatar babban adadin madaidaicin masana'anta da gogewar hannu, kuma gyaran yana buƙatar matakai da yawa da kuma tsawon lokacin gini.
Ana iya amfani da kayan haɗin gwiwar polymer don magance matsalar karce da damuwa akan nunin kayan aikin injin. Saboda kayan yana da kyakkyawar mannewa, ƙarfin matsawa, mai da juriya na abrasion, zai iya samar da kariya mai dorewa don sassa. Yana ɗaukar 'yan sa'o'i kaɗan kawai don gyara ɓangaren titin jagorar da aka toshe kuma a yi amfani da shi. Idan aka kwatanta da hanyar gargajiya, aikin ya fi sauƙi kuma farashin da ake bukata yana da ƙasa.
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