Iindaba

Ubukho bomaleko we-zinc buye bazisa ubunzima obuthile kwi-welding of galvanized steel. Iingxaki eziphambili zezi: uvakalelo olwandisiweyo lwe-welding cracks kunye ne-pores, i-zinc evaporation kunye nomsi, ukufakwa kwe-oxide slag, kunye nokunyibilika kunye nokulimala kwe-zinc coating. Phakathi kwazo, i-welding crack, umngxuma womoya kunye nokufakwa kwe-slag zezona ngxaki ziphambili,
Ukuweldability
(1) Intanda
Ngexesha le-welding, i-zinc etyhidiweyo idada phezu komphezulu we-pool etyhidiweyo okanye kwingcambu ye-weld. Ngenxa yokuba indawo yokunyibilika ye-zinc ingaphantsi kakhulu kuneyentsimbi, intsimbi ekwidama elinyibilikisiweyo ikhazimlisa kuqala, kwaye i-zinc ye-wavy iya kungena kuyo kunye nomda wengqolowa wentsimbi, ekhokelela ekunciphiseni kokubambisana kwe-intergranular. Ngaphezu koko, kulula ukwenza i-intermetallic brittle compounds Fe3Zn10 kunye ne-FeZn10 phakathi kwe-zinc kunye nentsimbi, eyancipha ngakumbi i-plasticity ye-weld metal, ngoko kulula ukuqhekeza kunye nomda weenkozo kunye nokwenza iintanda phantsi kwefuthe le-welding yoxinzelelo olushiyekileyo.
Izinto ezichaphazela ubuntununtunu bokuqhekeka: ① Ubungqingqwa bomaleko we-zinc: umaleko we-zinc wentsimbi enezinki ubhityile kwaye uvakalelo lokuqhekeka luncinci, ngelixa i-zinc layer yentsimbi eshushu yediphu ijiyile kwaye uvakalelo lokuqhekeka lukhulu. ② Ubungqingqwa besixhobo sokusebenza: okukhona ubukhulu becala, kokukhona kukho uthintelo olukhulu lwe-welding kwaye kokukhona uvakalelo lokuqhekeka. ③ Umsantsa weGroove: umsantsa
Inkulu, imvakalelo yokuqhekeka okukhulu. ④ Indlela ye-Welding: uvakalelo lwe-crack luncinci xa i-arc welding isetyenziswa, kodwa inkulu xa i-CO2 ikhuselwe i-welding yegesi.
Iindlela zokuthintela iintanda: ① Phambi kokuwelda, vula i-V-shaped, i-Y-shaped or X-shaped groove kwindawo ye-welding ye-galvanized sheet, susa i-zinc coating kufuphi ne-groove nge-oxyacetylene okanye ukuqhushumba kwesanti, kwaye ulawule umsantsa ukuba ungangeni. ibe nkulu kakhulu, ngokubanzi malunga ne-1.5mm. ② Khetha izinto ze-welding ezinomxholo ophantsi we-Si. Ucingo lokuwelda olunomxholo ophantsi we-Si luya kusetyenziselwa ukuwelda igesi ekhuselekileyo, kwaye uhlobo lwe-titanium kunye ne-titanium-calcium uhlobo lwentonga ye-welding iya kusetyenziselwa ukuwelda ngesandla.
(2) Stomata
I-zinc layer kufuphi ne-groove iya ku-oxidize (ifom ye-ZnO) kwaye ikhuphe phantsi kwesenzo sobushushu be-arc, kwaye ikhuphe umsi omhlophe kunye nomphunga, ngoko kulula kakhulu ukubangela i-pores kwi-weld. Okukhona umsinga wokuwelda umkhulu, kokukhona ubushushu be-zinc bunobuzaza kwaye kokukhona uvakalelo lwe-porosity luba lukhulu. Akulula ukuvelisa iipores kuluhlu oluphakathi lwangoku xa usebenzisa uhlobo lwe-titanium kunye nohlobo lwe-titanium-calcium imicu eqaqambileyo yokuwelda. Nangona kunjalo, xa uhlobo lwe-cellulose kunye ne-electrode yohlobo lwe-hydrogen ephantsi isetyenziselwa ukuwelda, iipores kulula ukwenzeka phantsi kwangoku ophantsi kunye nokuphezulu kwangoku. Ukongeza, i-engile electrode kufuneka ilawulwe ngaphakathi 30 ° ~ 70 ° kangangoko kunokwenzeka.
(3) Umoya weZinc kunye nomsi
Xa ipleyiti yentsimbi edibeneyo idityaniswe nge-arc welding yombane, i-zinc layer kufuphi ne-pool etyhidiweyo i-oxidized kwi-ZnO kwaye i-evaporated phantsi kwesenzo sobushushu be-arc, yenze umsi omkhulu womsi. Inxalenye ephambili yolu hlobo lomsi yi-ZnO, enempembelelo enkulu yokuvuselela kwizitho zokuphefumula zabasebenzi. Ngoko ke, amanyathelo afanelekileyo okungena komoya kufuneka athathwe ngexesha le-welding. Ngaphantsi kwenkcazelo efanayo ye-welding, umyinge womsi oveliswa nge-welding nge-titanium oxide uhlobo lwe-electrode uphantsi, ngelixa umsi womsi oveliswa ngokudibanisa nge-electrode yohlobo lwe-hydrogen ephantsi mkhulu. (4) Ukufakwa kwe-oxide
Xa i-welding current incinci, i-ZnO eyenziwe kwinkqubo yokufudumala ayilula ukubaleka, okulula ukubangela ukufakwa kwe-slag ye-ZnO. I-ZnO izinzile kwaye indawo yayo yokunyibilika yi-1800 ℃. Ukufakwa okukhulu kwe-ZnO kunefuthe elibi kakhulu kwi-weld plasticity. Xa i-titanium oxide electrode isetyenziswa, i-ZnO ilungile kwaye isasazwe ngokulinganayo, enefuthe elincinci kwiplastiki kunye namandla okuqina. Xa uhlobo lwe-cellulose okanye uhlobo lwe-hydrogen electrode lusetyenziswa, i-ZnO kwi-weld inkulu kwaye ininzi, kwaye ukusebenza kwe-weld kubi.