Matsalolin gama gari a cikin waldawar Magnesium Alloy

(1) M crystal

Magnesium yana da ƙarancin narkewa kuma yana da ƙarfin ƙarfin zafi. Ana buƙatar tushen zafi mai ƙarfi mai ƙarfi yayin walda. Wuraren walda da kusa-kusa suna da saurin zafi, haɓakar hatsi, rarrabuwar kristal da sauran abubuwan mamaki, waɗanda ke rage aikin haɗin gwiwa.

(2) Oxidation da evaporation

Magnesium yana da ƙarfi sosai kuma yana haɗuwa da sauƙi tare da iskar oxygen. Yana da sauƙi don samar da MgO yayin aikin walda. MgO yana da babban wurin narkewa (2 500 ℃) da yawa (3. 2 g / cm-3), kuma yana da sauƙi don samar da ƙananan flakes a cikin weld. M slag inclusions ba kawai tsanani hana samuwar weld, amma kuma rage yi na weld. A matsanancin yanayin walda, magnesium na iya haɗawa cikin sauƙi da nitrogen a cikin iska don samar da magnesium nitride. Haɗin ƙwayar magnesium nitride slag shima zai haifar da raguwa a cikin filastik na ƙarfe na weld kuma yana cutar da aikin haɗin gwiwa. Matsakaicin tafasa na magnesium ba shi da girma (1100 ℃) kuma yana da sauƙi don ƙafe a ƙarƙashin babban zafin jiki na baka.

(3) Konewa da rugujewar sassan sirara

Lokacin walda sassa na bakin ciki, saboda ƙarancin narkewar ma'adinin magnesium gami da babban wurin narkewar magnesium oxide, waɗannan biyun ba su da sauƙi a haɗa su, yana sa yana da wahala a lura da tsarin narkewar ɗinkin walda yayin ayyukan walda. Yayin da zafin jiki ya tashi, launin ruwan narkakkar ba ya canzawa sosai, yana sa ya zama mai saurin konewa da rushewa.

(4) Damuwa mai zafi da tsagewa

Magnesium da magnesium gami suna da ingantacciyar madaidaicin haɓakar haɓakar thermal, kusan ninki biyu na ƙarfe da 1 Sau biyu, yana da sauƙi don haifar da damuwa mai mahimmanci da nakasar walda yayin aikin walda. Magnesium a sauƙaƙe yana samar da ƙarancin narkewar ma'aunin eutectic tare da wasu abubuwan alloying (kamar Cu, Al, Ni, da sauransu) (kamar Mg Cu eutectic zafin jiki na 480 ℃, Mg Al eutectic zafin jiki na 430 ℃, Mg Ni eutectic zafin jiki na 508 ℃) , tare da kewayon zafin jiki mai faɗi da sauƙin samuwar fashewar zafi. Bincike ya gano cewa lokacin da w (Zn)> 1%, yana ƙara haɓakar zafin jiki kuma yana iya haifar da fashewar walda. Ƙara w (Al) ≤ 10% zuwa magnesium na iya tace girman hatsin walda da inganta walƙiya. Magnesium Alloys dauke da karamin adadin Th suna da kyau weldability kuma babu hali ga fashe.

(5) Ciwon ciki

Ana samar da pores na hydrogen cikin sauƙi yayin waldawar magnesium, kuma solubility na hydrogen a cikin magnesium shima yana raguwa sosai tare da raguwar zafin jiki.

(6) Magnesium da alluran sa suna da haɗari ga oxidation da konewa a lokacin walda a cikin yanayin iska, kuma suna buƙatar kariya ta iskar gas ko juzu'i yayin waldawar fusion ·