Labarai

Kasancewar Layer na zinc ya kawo wasu matsaloli ga waldar karfen galvanized.Babban matsalolin su ne: ƙarar hankali na fasa walda da pores, fitar da tutiya da hayaki, haɗakar da oxide slag, da narkewa da lalacewar tutiya.Daga cikin su, welding crack, air hole da slag hada su ne manyan matsalolin.
Weldability
(1) Tsage
A lokacin walda, narkakkar zinc tana yawo a saman tafkin ruwan narkakkar ko kuma a tushen walda.Domin ma’aunin narkewar zinc ya yi ƙasa da na baƙin ƙarfe, ƙarfen da ke cikin tafki narkakkar ya fara yin crystallizes, kuma zinc ɗin da ke kaɗawa zai kutsa cikinsa tare da iyakar hatsi na ƙarfe, wanda zai haifar da raunana haɗin haɗin gwiwa.Haka kuma, yana da sauƙi a samar da intermetallic gaggautsa mahadi Fe3Zn10 da FeZn10 tsakanin tutiya da baƙin ƙarfe, wanda kara rage plasticity na weld karfe, don haka yana da sauki crack tare da hatsi iyaka da kuma samar da fasa a karkashin sakamakon waldi saura danniya.
Abubuwan da ke damun tsattsauran ra'ayi: ① Kauri na zinc Layer: Layer zinc na galvanized karfe yana da sirara kuma ƙwanƙwasa ƙarami ne, yayin da layin zinc na ƙarfe mai zafi mai tsomawa yana da kauri kuma tsautsayi yana da girma.② Workpiece kauri: mafi girma da kauri, da girma da waldi hana danniya da kuma mafi girma da fasa ji na ƙwarai.③ Tsagi tazara: rata
Ya fi girma, mafi girman karfin hankali.④ Hanyar walƙiya: ƙarancin ƙima yana ƙarami lokacin da ake amfani da walda ta hannu, amma mafi girma lokacin amfani da walda mai kariya ta CO2.
Hanyoyin da za a hana fasa: ① Kafin waldawa, bude V-dimbin yawa, Y-dimbin yawa ko X-dimbin tsagi a matsayin waldi na galvanized takardar, cire tutiya shafi kusa da tsagi ta oxyacetylene ko yashi ayukan iska mai ƙarfi, da sarrafa ratar kada zuwa zama babba, gabaɗaya kusan 1.5mm.② Zaɓi kayan walda tare da ƙarancin abun ciki na Si.Za a yi amfani da wayar walda tare da ƙananan abun ciki na Sis don waldawar iskar gas, kuma nau'in titanium da sandar walda irin na titanium-calcium za a yi amfani da shi don waldawar hannu.
(2) Tumatir
Zinc Layer kusa da tsagi zai oxidize (form ZnO) da kuma ƙafe a karkashin aikin baka zafi, kuma emit farin hayaki da tururi, don haka yana da sauqi a sa pores a cikin weld.Mafi girman halin walda shine, mafi girman ƙawancen tutiya shine kuma mafi girman halayen porosity shine.Ba shi da sauƙi don samar da pores a cikin matsakaici na yanzu lokacin amfani da nau'in titanium da nau'in titanium-calcium mai haske don waldawa.Duk da haka, lokacin da ake amfani da nau'in cellulose da ƙananan nau'in nau'in nau'in hydrogen don waldawa, pores suna da sauƙin faruwa a ƙarƙashin ƙananan halin yanzu da kuma babban halin yanzu.Bugu da kari, ya kamata a sarrafa kusurwar lantarki a cikin 30 ° ~ 70 ° kamar yadda zai yiwu.
(3) Zinc evaporation da hayaki
Lokacin da farantin karfen galvanized ɗin ke waldawa ta hanyar waldawar baka na lantarki, ɗigon zinc ɗin da ke kusa da narkakkar tafki ya zama oxidized zuwa ZnO kuma ya ƙafe ƙarƙashin aikin zafin baka, yana samar da hayaki mai yawa.Babban abin da ke tattare da irin wannan hayaki shine ZnO, wanda ke da tasirin gaske ga sassan numfashi na ma'aikata.Don haka, dole ne a ɗauki matakan samun iska mai kyau yayin walda.A ƙarƙashin ƙayyadaddun ƙayyadaddun walda, adadin hayakin da ake samarwa ta hanyar walda tare da nau'in lantarki irin titanium oxide yana da ƙasa, yayin da adadin hayakin da ake samarwa ta hanyar walda tare da ƙarancin lantarki irin na hydrogen yana da yawa.(4) Haɗin Oxide
Lokacin waldi na halin yanzu yana ƙarami, ZnO da aka kafa a cikin tsarin dumama ba sauƙi ba ne don tserewa, wanda ke da sauƙin haifar da haɗakar da ZnO slag.ZnO yana da ɗan kwanciyar hankali kuma wurin narkewa shine 1800 ℃.Manyan abubuwan da aka haɗa da ZnO suna da mummunan tasiri akan filastik weld.Lokacin da aka yi amfani da lantarki na titanium oxide, ZnO yana da kyau kuma yana rarrabawa, wanda ba shi da tasiri a kan filastik da ƙarfin ƙarfi.Lokacin da ake amfani da nau'in cellulose ko nau'in lantarki irin na hydrogen, ZnO a cikin walda ya fi girma kuma ya fi girma, kuma aikin walda ba shi da kyau.