Izindaba

Ukuba khona kwe-zinc layer kulethe ubunzima obuthile ekushiseleleni insimbi.Izinkinga eziyinhloko yilezi: ukuzwela okwenyuka kokuqhekeka kwe-welding kanye nama-pores, ukuhwamuka kwe-zinc kanye nentuthu, ukufakwa kwe-oxide slag, nokuncibilika nokulimala kwe-zinc coating.Phakathi kwazo, i-welding crack, imbobo yomoya kanye nokufakwa kwe-slag yizinkinga eziyinhloko,
Ukushisela
(1) Umfantu
Ngesikhathi sokushisela, i-zinc encibilikisiwe intanta phezu kwechibi elincibilikisiwe noma empandeni ye-weld.Ngenxa yokuthi iphoyinti lokuncibilika le-zinc liphansi kakhulu kunelensimbi, insimbi esechibini elincibilikisiwe icwebezela kuqala, futhi i-zinc engamagagasi izongena kulo igudle umngcele wokusanhlamvu wensimbi, okuholela ekubeni buthaka kokuhlangana kwe-intergranular.Ngaphezu kwalokho, kulula ukwenza ama-intermetallic brittle compounds i-Fe3Zn10 ne-FeZn10 phakathi kwe-zinc ne-iron, okuqhubeka nokunciphisa i-plasticity yensimbi ye-weld, ngakho-ke kulula ukuqhekeka emngceleni wokusanhlamvu bese kwakheka imifantu ngaphansi komphumela wokushisela ukucindezeleka okusalayo.
Izinto ezithinta ukuzwela kokuqhekeka: ① Ukuqina kongqimba lwezinc: ungqimba lwezinki lwensimbi oluthathiwe luncane futhi ukuzwela kokuqhekeka kuncane, kuyilapho ungqimba lwezinc lwensimbi ewugqinsi lwe-hot-dip luwugqinsi futhi ukuzwela kokuqhekeka kukhulu.② Ubukhulu bengcezu yokusebenzela: uma kukhulu ukujiya, kukhulu ukucindezelwa kwe-welding kanye nokuzwela kwe-crack.③ Igebe le-Groove: igebe
Okukhudlwana, ukuzwela kokuqhekeka okukhulu.④ Indlela yokushisela: ukuzwela kokuqhekeka kuncane uma kusetshenziswa i-arc welding, kodwa inkulu uma kusetshenziswa ukushisela okuvikelwe kwegesi ye-CO2.
Izindlela zokuvimbela ukuqhekeka: ① Ngaphambi kokushisela, vula imisele emise okuka-V, emise okuka-Y noma emise okuka-X endaweni yokushisela eshidini elinothayela, susa okunamathelayo eduze komsele nge-oxyacetylene noma ukuqhunyiswa kwesihlabathi, futhi ulawule igebe ukuthi ibe nkulu kakhulu, ngokuvamile ibe ngu-1.5mm.② Khetha izinto zokushisela ezinokuqukethwe okuphansi kwe-Si.Intambo yokushisela enokuqukethwe kwe-Si ephansi izosetshenziselwa ukushisela okuvikelwe ngegesi, futhi uhlobo lwe-titanium kanye nenduku yokushisela yohlobo lwe-titanium-calcium kuyosetshenziselwa ukushisela okwenziwa ngesandla.
(2) Stomata
I-zinc layer eduze ne-groove izokhipha i-oxidize (yakha i-ZnO) futhi ihwamuke ngaphansi kwesenzo sokushisa kwe-arc, futhi ikhiphe intuthu emhlophe nesimusi, ngakho-ke kulula kakhulu ukubangela ama-pores ku-weld.Uma amandla e-welding ekhudlwana, kubi kakhulu ukuhwamuka kwe-zinc futhi kukhulu ukuzwela kwe-porosity.Akulula ukukhiqiza ama-pores ebangeni elimaphakathi lamanje uma usebenzisa uhlobo lwe-titanium kanye nemicu egqamile yohlobo lwe-titanium-calcium yokushisela.Kodwa-ke, lapho uhlobo lwe-cellulose kanye nama-electrode ohlobo lwe-hydrogen aphansi asetshenziselwa ukushisela, ama-pores avela kalula ngaphansi kwamandla aphansi namanje aphezulu.Ngaphezu kwalokho, i-engeli ye-electrode kufanele ilawulwe ngaphakathi kwe-30 ° ~ 70 ° ngangokunokwenzeka.
(3) Ukuhwamuka kwe-zinc kanye nentuthu
Lapho i-galvanized steel plate ishiselwa nge-arc kagesi yokushisela, ungqimba lwezinki eduze kwechibi elincibilikisiwe lufakwe i-oxidized ku-ZnO futhi luhwamuke ngaphansi kwesenzo sokushisa kwe-arc, kwakheka intuthu enkulu.Ingxenye eyinhloko yalolu hlobo lwentuthu i-ZnO, enomthelela omkhulu ovuselelayo ezithweni zokuphefumula zabasebenzi.Ngakho-ke, izinyathelo ezinhle zokungenisa umoya kufanele zithathwe ngesikhathi sokushisela.Ngaphansi kokucaciswa okufanayo kokushisela, inani lentuthu elikhiqizwa ngokushisela nge-electrode yohlobo lwe-titanium oxide liphansi, kuyilapho inani lentuthu elikhiqizwa ukushisela nge-electrode yohlobo lwe-hydrogen likhulu.(4) Ukufakwa kwe-oxide
Uma i-welding current incane, i-ZnO eyakhiwe ekushiseni akulula ukuphunyuka, okulula ukubangela ukufakwa kwe-slag ye-ZnO.I-ZnO izinzile futhi indawo yayo yokuncibilika ingu-1800 ℃.Ukufakwa kwe-ZnO enkulu kunomphumela omubi kakhulu ku-weld plasticity.Uma kusetshenziswa i-titanium oxide electrode, i-ZnO ilungile futhi isatshalaliswa ngokulinganayo, engenamthelela omncane kupulasitiki namandla aqinile.Uma kusetshenziswa uhlobo lwe-cellulose noma i-electrode yohlobo lwe-hydrogen, i-ZnO ku-weld inkulu futhi iyanda, futhi ukusebenza kwe-weld kubi.